CVE-2021-47435 (GCVE-0-2021-47435)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:19 – Updated: 2025-05-21 08:31
VLAI?
Title
dm: fix mempool NULL pointer race when completing IO
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix mempool NULL pointer race when completing IO dm_io_dec_pending() calls end_io_acct() first and will then dec md in-flight pending count. But if a task is swapping DM table at same time this can result in a crash due to mempool->elements being NULL: task1 task2 do_resume ->do_suspend ->dm_wait_for_completion bio_endio ->clone_endio ->dm_io_dec_pending ->end_io_acct ->wakeup task1 ->dm_swap_table ->__bind ->__bind_mempools ->bioset_exit ->mempool_exit ->free_io [ 67.330330] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 ...... [ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO) [ 67.330510] pc : mempool_free+0x70/0xa0 [ 67.330515] lr : mempool_free+0x4c/0xa0 [ 67.330520] sp : ffffff8008013b20 [ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004 [ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8 [ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800 [ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800 [ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80 [ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c [ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd [ 67.330563] x15: 000000000093b41e x14: 0000000000000010 [ 67.330569] x13: 0000000000007f7a x12: 0000000034155555 [ 67.330574] x11: 0000000000000001 x10: 0000000000000001 [ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000 [ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a [ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001 [ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8 [ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970 [ 67.330609] Call trace: [ 67.330616] mempool_free+0x70/0xa0 [ 67.330627] bio_put+0xf8/0x110 [ 67.330638] dec_pending+0x13c/0x230 [ 67.330644] clone_endio+0x90/0x180 [ 67.330649] bio_endio+0x198/0x1b8 [ 67.330655] dec_pending+0x190/0x230 [ 67.330660] clone_endio+0x90/0x180 [ 67.330665] bio_endio+0x198/0x1b8 [ 67.330673] blk_update_request+0x214/0x428 [ 67.330683] scsi_end_request+0x2c/0x300 [ 67.330688] scsi_io_completion+0xa0/0x710 [ 67.330695] scsi_finish_command+0xd8/0x110 [ 67.330700] scsi_softirq_done+0x114/0x148 [ 67.330708] blk_done_softirq+0x74/0xd0 [ 67.330716] __do_softirq+0x18c/0x374 [ 67.330724] irq_exit+0xb4/0xb8 [ 67.330732] __handle_domain_irq+0x84/0xc0 [ 67.330737] gic_handle_irq+0x148/0x1b0 [ 67.330744] el1_irq+0xe8/0x190 [ 67.330753] lpm_cpuidle_enter+0x4f8/0x538 [ 67.330759] cpuidle_enter_state+0x1fc/0x398 [ 67.330764] cpuidle_enter+0x18/0x20 [ 67.330772] do_idle+0x1b4/0x290 [ 67.330778] cpu_startup_entry+0x20/0x28 [ 67.330786] secondary_start_kernel+0x160/0x170 Fix this by: 1) Establishing pointers to 'struct dm_io' members in dm_io_dec_pending() so that they may be passed into end_io_acct() _after_ free_io() is called. 2) Moving end_io_acct() after free_io().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d35aef9c60d310eff3eaddacce301efe877e2b7c (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 9e07272cca2ed76f7f6073f4444b1143828c8d87 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < ad1393b92e5059218d055bfec8f4946d85ad04c4 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d29c78d3f9c5d2604548c1065bf1ec212728ea61 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 6e506f07c5b561d673dd0b0d8f7f420cc48024fb (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d208b89401e073de986dc891037c5a668f5d5d95 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 4.9.313 , ≤ 4.9.* (semver)
Unaffected: 4.14.278 , ≤ 4.14.* (semver)
Unaffected: 4.19.242 , ≤ 4.19.* (semver)
Unaffected: 5.4.193 , ≤ 5.4.* (semver)
Unaffected: 5.10.113 , ≤ 5.10.* (semver)
Unaffected: 5.14.14 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47435",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-22T18:48:43.435062Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:13:25.705Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.225Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "d35aef9c60d310eff3eaddacce301efe877e2b7c",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "9e07272cca2ed76f7f6073f4444b1143828c8d87",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "ad1393b92e5059218d055bfec8f4946d85ad04c4",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "d29c78d3f9c5d2604548c1065bf1ec212728ea61",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "6e506f07c5b561d673dd0b0d8f7f420cc48024fb",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            },
            {
              "lessThan": "d208b89401e073de986dc891037c5a668f5d5d95",
              "status": "affected",
              "version": "6a8736d10cb413be95ea443ba40f25c93f4ef9b2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.37"
            },
            {
              "lessThan": "2.6.37",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.313",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.278",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.242",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.193",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.313",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.278",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.242",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.193",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.113",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14.14",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix mempool NULL pointer race when completing IO\n\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\nin-flight pending count. But if a task is swapping DM table at same\ntime this can result in a crash due to mempool-\u003eelements being NULL:\n\ntask1                             task2\ndo_resume\n -\u003edo_suspend\n  -\u003edm_wait_for_completion\n                                  bio_endio\n\t\t\t\t   -\u003eclone_endio\n\t\t\t\t    -\u003edm_io_dec_pending\n\t\t\t\t     -\u003eend_io_acct\n\t\t\t\t      -\u003ewakeup task1\n -\u003edm_swap_table\n  -\u003e__bind\n   -\u003e__bind_mempools\n    -\u003ebioset_exit\n     -\u003emempool_exit\n                                     -\u003efree_io\n\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\nvirtual address 0000000000000000\n......\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\n[ 67.330510] pc : mempool_free+0x70/0xa0\n[ 67.330515] lr : mempool_free+0x4c/0xa0\n[ 67.330520] sp : ffffff8008013b20\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\n[ 67.330609] Call trace:\n[ 67.330616] mempool_free+0x70/0xa0\n[ 67.330627] bio_put+0xf8/0x110\n[ 67.330638] dec_pending+0x13c/0x230\n[ 67.330644] clone_endio+0x90/0x180\n[ 67.330649] bio_endio+0x198/0x1b8\n[ 67.330655] dec_pending+0x190/0x230\n[ 67.330660] clone_endio+0x90/0x180\n[ 67.330665] bio_endio+0x198/0x1b8\n[ 67.330673] blk_update_request+0x214/0x428\n[ 67.330683] scsi_end_request+0x2c/0x300\n[ 67.330688] scsi_io_completion+0xa0/0x710\n[ 67.330695] scsi_finish_command+0xd8/0x110\n[ 67.330700] scsi_softirq_done+0x114/0x148\n[ 67.330708] blk_done_softirq+0x74/0xd0\n[ 67.330716] __do_softirq+0x18c/0x374\n[ 67.330724] irq_exit+0xb4/0xb8\n[ 67.330732] __handle_domain_irq+0x84/0xc0\n[ 67.330737] gic_handle_irq+0x148/0x1b0\n[ 67.330744] el1_irq+0xe8/0x190\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\n[ 67.330764] cpuidle_enter+0x18/0x20\n[ 67.330772] do_idle+0x1b4/0x290\n[ 67.330778] cpu_startup_entry+0x20/0x28\n[ 67.330786] secondary_start_kernel+0x160/0x170\n\nFix this by:\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\ndm_io_dec_pending() so that they may be passed into end_io_acct()\n_after_ free_io() is called.\n2) Moving end_io_acct() after free_io()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-21T08:31:48.566Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed"
        },
        {
          "url": "https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95"
        }
      ],
      "title": "dm: fix mempool NULL pointer race when completing IO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47435",
    "datePublished": "2024-05-22T06:19:31.562Z",
    "dateReserved": "2024-05-21T14:58:30.830Z",
    "dateUpdated": "2025-05-21T08:31:48.566Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.225Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47435\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-22T18:48:43.435062Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-22T18:48:58.118Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"dm: fix mempool NULL pointer race when completing IO\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"d35aef9c60d310eff3eaddacce301efe877e2b7c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"9e07272cca2ed76f7f6073f4444b1143828c8d87\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"ad1393b92e5059218d055bfec8f4946d85ad04c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"d29c78d3f9c5d2604548c1065bf1ec212728ea61\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"6e506f07c5b561d673dd0b0d8f7f420cc48024fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\", \"lessThan\": \"d208b89401e073de986dc891037c5a668f5d5d95\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/md/dm.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.37\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.37\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.313\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.278\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.242\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.193\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/md/dm.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\"}, {\"url\": \"https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c\"}, {\"url\": \"https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87\"}, {\"url\": \"https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4\"}, {\"url\": \"https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61\"}, {\"url\": \"https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb\"}, {\"url\": \"https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: fix mempool NULL pointer race when completing IO\\n\\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\\nin-flight pending count. But if a task is swapping DM table at same\\ntime this can result in a crash due to mempool-\u003eelements being NULL:\\n\\ntask1                             task2\\ndo_resume\\n -\u003edo_suspend\\n  -\u003edm_wait_for_completion\\n                                  bio_endio\\n\\t\\t\\t\\t   -\u003eclone_endio\\n\\t\\t\\t\\t    -\u003edm_io_dec_pending\\n\\t\\t\\t\\t     -\u003eend_io_acct\\n\\t\\t\\t\\t      -\u003ewakeup task1\\n -\u003edm_swap_table\\n  -\u003e__bind\\n   -\u003e__bind_mempools\\n    -\u003ebioset_exit\\n     -\u003emempool_exit\\n                                     -\u003efree_io\\n\\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000000\\n......\\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\\n[ 67.330510] pc : mempool_free+0x70/0xa0\\n[ 67.330515] lr : mempool_free+0x4c/0xa0\\n[ 67.330520] sp : ffffff8008013b20\\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\\n[ 67.330609] Call trace:\\n[ 67.330616] mempool_free+0x70/0xa0\\n[ 67.330627] bio_put+0xf8/0x110\\n[ 67.330638] dec_pending+0x13c/0x230\\n[ 67.330644] clone_endio+0x90/0x180\\n[ 67.330649] bio_endio+0x198/0x1b8\\n[ 67.330655] dec_pending+0x190/0x230\\n[ 67.330660] clone_endio+0x90/0x180\\n[ 67.330665] bio_endio+0x198/0x1b8\\n[ 67.330673] blk_update_request+0x214/0x428\\n[ 67.330683] scsi_end_request+0x2c/0x300\\n[ 67.330688] scsi_io_completion+0xa0/0x710\\n[ 67.330695] scsi_finish_command+0xd8/0x110\\n[ 67.330700] scsi_softirq_done+0x114/0x148\\n[ 67.330708] blk_done_softirq+0x74/0xd0\\n[ 67.330716] __do_softirq+0x18c/0x374\\n[ 67.330724] irq_exit+0xb4/0xb8\\n[ 67.330732] __handle_domain_irq+0x84/0xc0\\n[ 67.330737] gic_handle_irq+0x148/0x1b0\\n[ 67.330744] el1_irq+0xe8/0x190\\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\\n[ 67.330764] cpuidle_enter+0x18/0x20\\n[ 67.330772] do_idle+0x1b4/0x290\\n[ 67.330778] cpu_startup_entry+0x20/0x28\\n[ 67.330786] secondary_start_kernel+0x160/0x170\\n\\nFix this by:\\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\\ndm_io_dec_pending() so that they may be passed into end_io_acct()\\n_after_ free_io() is called.\\n2) Moving end_io_acct() after free_io().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.313\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.278\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.242\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.193\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.113\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.14\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.37\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:31:48.566Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47435\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:31:48.566Z\", \"dateReserved\": \"2024-05-21T14:58:30.830Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T06:19:31.562Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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.