CVE-2024-39483 (GCVE-0-2024-39483)

Vulnerability from cvelistv5 – Published: 2024-07-05 06:55 – Updated: 2025-05-04 09:16
VLAI?
Title
KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked When requesting an NMI window, WARN on vNMI support being enabled if and only if NMIs are actually masked, i.e. if the vCPU is already handling an NMI. KVM's ABI for NMIs that arrive simultanesouly (from KVM's point of view) is to inject one NMI and pend the other. When using vNMI, KVM pends the second NMI simply by setting V_NMI_PENDING, and lets the CPU do the rest (hardware automatically sets V_NMI_BLOCKING when an NMI is injected). However, if KVM can't immediately inject an NMI, e.g. because the vCPU is in an STI shadow or is running with GIF=0, then KVM will request an NMI window and trigger the WARN (but still function correctly). Whether or not the GIF=0 case makes sense is debatable, as the intent of KVM's behavior is to provide functionality that is as close to real hardware as possible. E.g. if two NMIs are sent in quick succession, the probability of both NMIs arriving in an STI shadow is infinitesimally low on real hardware, but significantly larger in a virtual environment, e.g. if the vCPU is preempted in the STI shadow. For GIF=0, the argument isn't as clear cut, because the window where two NMIs can collide is much larger in bare metal (though still small). That said, KVM should not have divergent behavior for the GIF=0 case based on whether or not vNMI support is enabled. And KVM has allowed simultaneous NMIs with GIF=0 for over a decade, since commit 7460fb4a3400 ("KVM: Fix simultaneous NMIs"). I.e. KVM's GIF=0 handling shouldn't be modified without a *really* good reason to do so, and if KVM's behavior were to be modified, it should be done irrespective of vNMI support.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fa4c027a7956f5e07697bfcb580d25eeb8471257 , < f79edaf7370986d73d204b36c50cc563a4c0f356 (git)
Affected: fa4c027a7956f5e07697bfcb580d25eeb8471257 , < 1d87cf2eba46deaff6142366127f2323de9f84d1 (git)
Affected: fa4c027a7956f5e07697bfcb580d25eeb8471257 , < b4bd556467477420ee3a91fbcba73c579669edc6 (git)
Create a notification for this product.
    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.34 , ≤ 6.6.* (semver)
Unaffected: 6.9.5 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T04:26:15.663Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/f79edaf7370986d73d204b36c50cc563a4c0f356"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/1d87cf2eba46deaff6142366127f2323de9f84d1"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/b4bd556467477420ee3a91fbcba73c579669edc6"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-39483",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:07:35.709839Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:41.168Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/svm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f79edaf7370986d73d204b36c50cc563a4c0f356",
              "status": "affected",
              "version": "fa4c027a7956f5e07697bfcb580d25eeb8471257",
              "versionType": "git"
            },
            {
              "lessThan": "1d87cf2eba46deaff6142366127f2323de9f84d1",
              "status": "affected",
              "version": "fa4c027a7956f5e07697bfcb580d25eeb8471257",
              "versionType": "git"
            },
            {
              "lessThan": "b4bd556467477420ee3a91fbcba73c579669edc6",
              "status": "affected",
              "version": "fa4c027a7956f5e07697bfcb580d25eeb8471257",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/svm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.34",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.5",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked\n\nWhen requesting an NMI window, WARN on vNMI support being enabled if and\nonly if NMIs are actually masked, i.e. if the vCPU is already handling an\nNMI.  KVM\u0027s ABI for NMIs that arrive simultanesouly (from KVM\u0027s point of\nview) is to inject one NMI and pend the other.  When using vNMI, KVM pends\nthe second NMI simply by setting V_NMI_PENDING, and lets the CPU do the\nrest (hardware automatically sets V_NMI_BLOCKING when an NMI is injected).\n\nHowever, if KVM can\u0027t immediately inject an NMI, e.g. because the vCPU is\nin an STI shadow or is running with GIF=0, then KVM will request an NMI\nwindow and trigger the WARN (but still function correctly).\n\nWhether or not the GIF=0 case makes sense is debatable, as the intent of\nKVM\u0027s behavior is to provide functionality that is as close to real\nhardware as possible.  E.g. if two NMIs are sent in quick succession, the\nprobability of both NMIs arriving in an STI shadow is infinitesimally low\non real hardware, but significantly larger in a virtual environment, e.g.\nif the vCPU is preempted in the STI shadow.  For GIF=0, the argument isn\u0027t\nas clear cut, because the window where two NMIs can collide is much larger\nin bare metal (though still small).\n\nThat said, KVM should not have divergent behavior for the GIF=0 case based\non whether or not vNMI support is enabled.  And KVM has allowed\nsimultaneous NMIs with GIF=0 for over a decade, since commit 7460fb4a3400\n(\"KVM: Fix simultaneous NMIs\").  I.e. KVM\u0027s GIF=0 handling shouldn\u0027t be\nmodified without a *really* good reason to do so, and if KVM\u0027s behavior\nwere to be modified, it should be done irrespective of vNMI support."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:16:45.307Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f79edaf7370986d73d204b36c50cc563a4c0f356"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d87cf2eba46deaff6142366127f2323de9f84d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4bd556467477420ee3a91fbcba73c579669edc6"
        }
      ],
      "title": "KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-39483",
    "datePublished": "2024-07-05T06:55:11.270Z",
    "dateReserved": "2024-06-25T14:23:23.747Z",
    "dateUpdated": "2025-05-04T09:16:45.307Z",
    "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/f79edaf7370986d73d204b36c50cc563a4c0f356\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1d87cf2eba46deaff6142366127f2323de9f84d1\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/b4bd556467477420ee3a91fbcba73c579669edc6\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T04:26:15.663Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-39483\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:07:35.709839Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:25.198Z\"}}], \"cna\": {\"title\": \"KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"fa4c027a7956f5e07697bfcb580d25eeb8471257\", \"lessThan\": \"f79edaf7370986d73d204b36c50cc563a4c0f356\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa4c027a7956f5e07697bfcb580d25eeb8471257\", \"lessThan\": \"1d87cf2eba46deaff6142366127f2323de9f84d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa4c027a7956f5e07697bfcb580d25eeb8471257\", \"lessThan\": \"b4bd556467477420ee3a91fbcba73c579669edc6\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/kvm/svm/svm.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kvm/svm/svm.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f79edaf7370986d73d204b36c50cc563a4c0f356\"}, {\"url\": \"https://git.kernel.org/stable/c/1d87cf2eba46deaff6142366127f2323de9f84d1\"}, {\"url\": \"https://git.kernel.org/stable/c/b4bd556467477420ee3a91fbcba73c579669edc6\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked\\n\\nWhen requesting an NMI window, WARN on vNMI support being enabled if and\\nonly if NMIs are actually masked, i.e. if the vCPU is already handling an\\nNMI.  KVM\u0027s ABI for NMIs that arrive simultanesouly (from KVM\u0027s point of\\nview) is to inject one NMI and pend the other.  When using vNMI, KVM pends\\nthe second NMI simply by setting V_NMI_PENDING, and lets the CPU do the\\nrest (hardware automatically sets V_NMI_BLOCKING when an NMI is injected).\\n\\nHowever, if KVM can\u0027t immediately inject an NMI, e.g. because the vCPU is\\nin an STI shadow or is running with GIF=0, then KVM will request an NMI\\nwindow and trigger the WARN (but still function correctly).\\n\\nWhether or not the GIF=0 case makes sense is debatable, as the intent of\\nKVM\u0027s behavior is to provide functionality that is as close to real\\nhardware as possible.  E.g. if two NMIs are sent in quick succession, the\\nprobability of both NMIs arriving in an STI shadow is infinitesimally low\\non real hardware, but significantly larger in a virtual environment, e.g.\\nif the vCPU is preempted in the STI shadow.  For GIF=0, the argument isn\u0027t\\nas clear cut, because the window where two NMIs can collide is much larger\\nin bare metal (though still small).\\n\\nThat said, KVM should not have divergent behavior for the GIF=0 case based\\non whether or not vNMI support is enabled.  And KVM has allowed\\nsimultaneous NMIs with GIF=0 for over a decade, since commit 7460fb4a3400\\n(\\\"KVM: Fix simultaneous NMIs\\\").  I.e. KVM\u0027s GIF=0 handling shouldn\u0027t be\\nmodified without a *really* good reason to do so, and if KVM\u0027s behavior\\nwere to be modified, it should be done irrespective of vNMI support.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:07:03.497Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-39483\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:07:03.497Z\", \"dateReserved\": \"2024-06-25T14:23:23.747Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-05T06:55:11.270Z\", \"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.