CVE-2022-48853 (GCVE-0-2022-48853)

Vulnerability from cvelistv5 – Published: 2024-07-16 12:25 – Updated: 2025-12-21 11:36
VLAI?
Title
Reinstate some of "swiotlb: rework "fix info leak with DMA_FROM_DEVICE""
Summary
In the Linux kernel, the following vulnerability has been resolved: swiotlb: fix info leak with DMA_FROM_DEVICE The problem I'm addressing was discovered by the LTP test covering cve-2018-1000204. A short description of what happens follows: 1) The test case issues a command code 00 (TEST UNIT READY) via the SG_IO interface with: dxfer_len == 524288, dxdfer_dir == SG_DXFER_FROM_DEV and a corresponding dxferp. The peculiar thing about this is that TUR is not reading from the device. 2) In sg_start_req() the invocation of blk_rq_map_user() effectively bounces the user-space buffer. As if the device was to transfer into it. Since commit a45b599ad808 ("scsi: sg: allocate with __GFP_ZERO in sg_build_indirect()") we make sure this first bounce buffer is allocated with GFP_ZERO. 3) For the rest of the story we keep ignoring that we have a TUR, so the device won't touch the buffer we prepare as if the we had a DMA_FROM_DEVICE type of situation. My setup uses a virtio-scsi device and the buffer allocated by SG is mapped by the function virtqueue_add_split() which uses DMA_FROM_DEVICE for the "in" sgs (here scatter-gather and not scsi generics). This mapping involves bouncing via the swiotlb (we need swiotlb to do virtio in protected guest like s390 Secure Execution, or AMD SEV). 4) When the SCSI TUR is done, we first copy back the content of the second (that is swiotlb) bounce buffer (which most likely contains some previous IO data), to the first bounce buffer, which contains all zeros. Then we copy back the content of the first bounce buffer to the user-space buffer. 5) The test case detects that the buffer, which it zero-initialized, ain't all zeros and fails. One can argue that this is an swiotlb problem, because without swiotlb we leak all zeros, and the swiotlb should be transparent in a sense that it does not affect the outcome (if all other participants are well behaved). Copying the content of the original buffer into the swiotlb buffer is the only way I can think of to make swiotlb transparent in such scenarios. So let's do just that if in doubt, but allow the driver to tell us that the whole mapped buffer is going to be overwritten, in which case we can preserve the old behavior and avoid the performance impact of the extra bounce.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fd97de9c7b973f46a6103f4170c5efc7b8ef8797 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aaf166f37eb6bb55d81c3e40a2a460c8875c8813 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 06cb238b0f7ac1669cb06390704c61794724c191 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b2f140a9f980806f572d672e1780acea66b9a25c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3f2247ac31cb71d1f05f56536df5946c6652f4a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7007c894631cf43041dcfa0da7142bbaa7eb673c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dcead36b19d999d687cd9c99b7f37520d9102b57 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f2141881b530738777c28bb51c62175895c8178b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 901c7280ca0d5e2b4a8929fbe0bfb007ac2a6544 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.320 , ≤ 4.9.* (semver)
Unaffected: 4.14.281 , ≤ 4.14.* (semver)
Unaffected: 4.19.245 , ≤ 4.19.* (semver)
Unaffected: 5.4.196 , ≤ 5.4.* (semver)
Unaffected: 5.10.118 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T15:25:01.804Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c132f2ba716b5ee6b35f82226a6e5417d013d753"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/971e5dadffd02beba1063e7dd9c3a82de17cf534"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/8d9ac1b6665c73f23e963775f85d99679fd8e192"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6bfc5377a210dbda2a237f16d94d1bd4f1335026"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d4d975e7921079f877f828099bb8260af335508f"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/7403f4118ab94be837ab9d770507537a8057bc63"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/270475d6d2410ec66e971bf181afe1958dad565e"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ddbd89deb7d32b1fbb879f48d68fda1a8ac58e8e"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48853",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:25:58.844703Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:08.301Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "Documentation/core-api/dma-attributes.rst",
            "include/linux/dma-mapping.h",
            "kernel/dma/swiotlb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fd97de9c7b973f46a6103f4170c5efc7b8ef8797",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "aaf166f37eb6bb55d81c3e40a2a460c8875c8813",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "06cb238b0f7ac1669cb06390704c61794724c191",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b2f140a9f980806f572d672e1780acea66b9a25c",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "f3f2247ac31cb71d1f05f56536df5946c6652f4a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "7007c894631cf43041dcfa0da7142bbaa7eb673c",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "dcead36b19d999d687cd9c99b7f37520d9102b57",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "f2141881b530738777c28bb51c62175895c8178b",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "901c7280ca0d5e2b4a8929fbe0bfb007ac2a6544",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "Documentation/core-api/dma-attributes.rst",
            "include/linux/dma-mapping.h",
            "kernel/dma/swiotlb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.320",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.281",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.245",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.118",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.320",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.281",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.245",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.196",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.118",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.33",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.19",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nswiotlb: fix info leak with DMA_FROM_DEVICE\n\nThe problem I\u0027m addressing was discovered by the LTP test covering\ncve-2018-1000204.\n\nA short description of what happens follows:\n1) The test case issues a command code 00 (TEST UNIT READY) via the SG_IO\n   interface with: dxfer_len == 524288, dxdfer_dir == SG_DXFER_FROM_DEV\n   and a corresponding dxferp. The peculiar thing about this is that TUR\n   is not reading from the device.\n2) In sg_start_req() the invocation of blk_rq_map_user() effectively\n   bounces the user-space buffer. As if the device was to transfer into\n   it. Since commit a45b599ad808 (\"scsi: sg: allocate with __GFP_ZERO in\n   sg_build_indirect()\") we make sure this first bounce buffer is\n   allocated with GFP_ZERO.\n3) For the rest of the story we keep ignoring that we have a TUR, so the\n   device won\u0027t touch the buffer we prepare as if the we had a\n   DMA_FROM_DEVICE type of situation. My setup uses a virtio-scsi device\n   and the  buffer allocated by SG is mapped by the function\n   virtqueue_add_split() which uses DMA_FROM_DEVICE for the \"in\" sgs (here\n   scatter-gather and not scsi generics). This mapping involves bouncing\n   via the swiotlb (we need swiotlb to do virtio in protected guest like\n   s390 Secure Execution, or AMD SEV).\n4) When the SCSI TUR is done, we first copy back the content of the second\n   (that is swiotlb) bounce buffer (which most likely contains some\n   previous IO data), to the first bounce buffer, which contains all\n   zeros.  Then we copy back the content of the first bounce buffer to\n   the user-space buffer.\n5) The test case detects that the buffer, which it zero-initialized,\n  ain\u0027t all zeros and fails.\n\nOne can argue that this is an swiotlb problem, because without swiotlb\nwe leak all zeros, and the swiotlb should be transparent in a sense that\nit does not affect the outcome (if all other participants are well\nbehaved).\n\nCopying the content of the original buffer into the swiotlb buffer is\nthe only way I can think of to make swiotlb transparent in such\nscenarios. So let\u0027s do just that if in doubt, but allow the driver\nto tell us that the whole mapped buffer is going to be overwritten,\nin which case we can preserve the old behavior and avoid the performance\nimpact of the extra bounce."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-21T11:36:18.947Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fd97de9c7b973f46a6103f4170c5efc7b8ef8797"
        },
        {
          "url": "https://git.kernel.org/stable/c/aaf166f37eb6bb55d81c3e40a2a460c8875c8813"
        },
        {
          "url": "https://git.kernel.org/stable/c/06cb238b0f7ac1669cb06390704c61794724c191"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2f140a9f980806f572d672e1780acea66b9a25c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3f2247ac31cb71d1f05f56536df5946c6652f4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7007c894631cf43041dcfa0da7142bbaa7eb673c"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcead36b19d999d687cd9c99b7f37520d9102b57"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2141881b530738777c28bb51c62175895c8178b"
        },
        {
          "url": "https://git.kernel.org/stable/c/901c7280ca0d5e2b4a8929fbe0bfb007ac2a6544"
        }
      ],
      "title": "Reinstate some of \"swiotlb: rework \"fix info leak with DMA_FROM_DEVICE\"\"",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48853",
    "datePublished": "2024-07-16T12:25:19.814Z",
    "dateReserved": "2024-07-16T11:38:08.913Z",
    "dateUpdated": "2025-12-21T11:36:18.947Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c132f2ba716b5ee6b35f82226a6e5417d013d753\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/971e5dadffd02beba1063e7dd9c3a82de17cf534\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8d9ac1b6665c73f23e963775f85d99679fd8e192\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6bfc5377a210dbda2a237f16d94d1bd4f1335026\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d4d975e7921079f877f828099bb8260af335508f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7403f4118ab94be837ab9d770507537a8057bc63\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/270475d6d2410ec66e971bf181afe1958dad565e\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ddbd89deb7d32b1fbb879f48d68fda1a8ac58e8e\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T15:25:01.804Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48853\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:25:58.844703Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:20.896Z\"}}], \"cna\": {\"title\": \"Reinstate some of \\\"swiotlb: rework \\\"fix info leak with DMA_FROM_DEVICE\\\"\\\"\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"fd97de9c7b973f46a6103f4170c5efc7b8ef8797\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"aaf166f37eb6bb55d81c3e40a2a460c8875c8813\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"06cb238b0f7ac1669cb06390704c61794724c191\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"b2f140a9f980806f572d672e1780acea66b9a25c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"f3f2247ac31cb71d1f05f56536df5946c6652f4a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"7007c894631cf43041dcfa0da7142bbaa7eb673c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"dcead36b19d999d687cd9c99b7f37520d9102b57\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"f2141881b530738777c28bb51c62175895c8178b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"901c7280ca0d5e2b4a8929fbe0bfb007ac2a6544\", \"versionType\": \"git\"}], \"programFiles\": [\"Documentation/core-api/dma-attributes.rst\", \"include/linux/dma-mapping.h\", \"kernel/dma/swiotlb.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.320\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.281\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.245\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.196\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.118\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"Documentation/core-api/dma-attributes.rst\", \"include/linux/dma-mapping.h\", \"kernel/dma/swiotlb.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/fd97de9c7b973f46a6103f4170c5efc7b8ef8797\"}, {\"url\": \"https://git.kernel.org/stable/c/aaf166f37eb6bb55d81c3e40a2a460c8875c8813\"}, {\"url\": \"https://git.kernel.org/stable/c/06cb238b0f7ac1669cb06390704c61794724c191\"}, {\"url\": \"https://git.kernel.org/stable/c/b2f140a9f980806f572d672e1780acea66b9a25c\"}, {\"url\": \"https://git.kernel.org/stable/c/f3f2247ac31cb71d1f05f56536df5946c6652f4a\"}, {\"url\": \"https://git.kernel.org/stable/c/7007c894631cf43041dcfa0da7142bbaa7eb673c\"}, {\"url\": \"https://git.kernel.org/stable/c/dcead36b19d999d687cd9c99b7f37520d9102b57\"}, {\"url\": \"https://git.kernel.org/stable/c/f2141881b530738777c28bb51c62175895c8178b\"}, {\"url\": \"https://git.kernel.org/stable/c/901c7280ca0d5e2b4a8929fbe0bfb007ac2a6544\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nswiotlb: fix info leak with DMA_FROM_DEVICE\\n\\nThe problem I\u0027m addressing was discovered by the LTP test covering\\ncve-2018-1000204.\\n\\nA short description of what happens follows:\\n1) The test case issues a command code 00 (TEST UNIT READY) via the SG_IO\\n   interface with: dxfer_len == 524288, dxdfer_dir == SG_DXFER_FROM_DEV\\n   and a corresponding dxferp. The peculiar thing about this is that TUR\\n   is not reading from the device.\\n2) In sg_start_req() the invocation of blk_rq_map_user() effectively\\n   bounces the user-space buffer. As if the device was to transfer into\\n   it. Since commit a45b599ad808 (\\\"scsi: sg: allocate with __GFP_ZERO in\\n   sg_build_indirect()\\\") we make sure this first bounce buffer is\\n   allocated with GFP_ZERO.\\n3) For the rest of the story we keep ignoring that we have a TUR, so the\\n   device won\u0027t touch the buffer we prepare as if the we had a\\n   DMA_FROM_DEVICE type of situation. My setup uses a virtio-scsi device\\n   and the  buffer allocated by SG is mapped by the function\\n   virtqueue_add_split() which uses DMA_FROM_DEVICE for the \\\"in\\\" sgs (here\\n   scatter-gather and not scsi generics). This mapping involves bouncing\\n   via the swiotlb (we need swiotlb to do virtio in protected guest like\\n   s390 Secure Execution, or AMD SEV).\\n4) When the SCSI TUR is done, we first copy back the content of the second\\n   (that is swiotlb) bounce buffer (which most likely contains some\\n   previous IO data), to the first bounce buffer, which contains all\\n   zeros.  Then we copy back the content of the first bounce buffer to\\n   the user-space buffer.\\n5) The test case detects that the buffer, which it zero-initialized,\\n  ain\u0027t all zeros and fails.\\n\\nOne can argue that this is an swiotlb problem, because without swiotlb\\nwe leak all zeros, and the swiotlb should be transparent in a sense that\\nit does not affect the outcome (if all other participants are well\\nbehaved).\\n\\nCopying the content of the original buffer into the swiotlb buffer is\\nthe only way I can think of to make swiotlb transparent in such\\nscenarios. So let\u0027s do just that if in doubt, but allow the driver\\nto tell us that the whole mapped buffer is going to be overwritten,\\nin which case we can preserve the old behavior and avoid the performance\\nimpact of the extra bounce.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.320\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.281\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.245\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.196\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.118\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-21T11:36:18.947Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48853\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-21T11:36:18.947Z\", \"dateReserved\": \"2024-07-16T11:38:08.913Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T12:25:19.814Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.