CVE-2026-45987 (GCVE-0-2026-45987)
Vulnerability from cvelistv5
Published
2026-05-27 12:55
Modified
2026-06-14 17:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2 After VMRUN in guest mode, nested_sync_control_from_vmcb02() syncs fields written by the CPU from vmcb02 to the cached vmcb12. This is because the cached vmcb12 is used as the authoritative copy of some of the controls, and is the payload when saving/restoring nested state. int_state is also written by the CPU, specifically bit 0 (i.e. SVM_INTERRUPT_SHADOW_MASK) for nested VMs, but it is not sync'd to cached vmcb12. This does not cause a problem if KVM_SET_NESTED_STATE preceeds KVM_SET_VCPU_EVENTS in the restore path, as an interrupt shadow would be correctly restored to vmcb02 (KVM_SET_VCPU_EVENTS overwrites what KVM_SET_NESTED_STATE restored in int_state). However, if KVM_SET_VCPU_EVENTS preceeds KVM_SET_NESTED_STATE, an interrupt shadow would be restored into vmcb01 instead of vmcb02. This would mostly be benign for L1 (delays an interrupt), but not for L2. For L2, the vCPU could hang (e.g. if a wakeup interrupt is delivered before a HLT that should have been in an interrupt shadow). Sync int_state to the cached vmcb12 in nested_sync_control_from_vmcb02() to avoid this problem. With that, KVM_SET_NESTED_STATE restores the correct interrupt shadow state, and if KVM_SET_VCPU_EVENTS follows it would overwrite it with the same value.
Impacted products
Vendor Product Version
Linux Linux Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Version: cc440cdad5b7a4c1de12dace725209eb3e0cf663
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0c1f74d8b74d8a31751fb6ea5417e48e02c93b58",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "4b44aa1a134e499c4517597118378b308602a16c",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "e39a77a9b1e17d2d831c304eafac4c41a784a0be",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "1709418535a8df95532999d61b03d59975280258",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "2f950eeb27af6885416232761700b8820cae0a61",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "497f6af9679fc9c6ce2f438e11ed5d51b1aa8297",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "e0377e52f3c10ee572732d11b04625b7f517a862",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            },
            {
              "lessThan": "03bee264f8ebfd39e0254c98e112d033a7aa9055",
              "status": "affected",
              "version": "cc440cdad5b7a4c1de12dace725209eb3e0cf663",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.86",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.27",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2\n\nAfter VMRUN in guest mode, nested_sync_control_from_vmcb02() syncs\nfields written by the CPU from vmcb02 to the cached vmcb12. This is\nbecause the cached vmcb12 is used as the authoritative copy of some of\nthe controls, and is the payload when saving/restoring nested state.\n\nint_state is also written by the CPU, specifically bit 0 (i.e.\nSVM_INTERRUPT_SHADOW_MASK) for nested VMs, but it is not sync\u0027d to\ncached vmcb12. This does not cause a problem if KVM_SET_NESTED_STATE\npreceeds KVM_SET_VCPU_EVENTS in the restore path, as an interrupt shadow\nwould be correctly restored to vmcb02 (KVM_SET_VCPU_EVENTS overwrites\nwhat KVM_SET_NESTED_STATE restored in int_state).\n\nHowever, if KVM_SET_VCPU_EVENTS preceeds KVM_SET_NESTED_STATE, an\ninterrupt shadow would be restored into vmcb01 instead of vmcb02. This\nwould mostly be benign for L1 (delays an interrupt), but not for L2. For\nL2, the vCPU could hang (e.g. if a wakeup interrupt is delivered before\na HLT that should have been in an interrupt shadow).\n\nSync int_state to the cached vmcb12 in nested_sync_control_from_vmcb02()\nto avoid this problem. With that, KVM_SET_NESTED_STATE restores the\ncorrect interrupt shadow state, and if KVM_SET_VCPU_EVENTS follows it\nwould overwrite it with the same value."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:46:36.929Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0c1f74d8b74d8a31751fb6ea5417e48e02c93b58"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b44aa1a134e499c4517597118378b308602a16c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e39a77a9b1e17d2d831c304eafac4c41a784a0be"
        },
        {
          "url": "https://git.kernel.org/stable/c/1709418535a8df95532999d61b03d59975280258"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f950eeb27af6885416232761700b8820cae0a61"
        },
        {
          "url": "https://git.kernel.org/stable/c/497f6af9679fc9c6ce2f438e11ed5d51b1aa8297"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0377e52f3c10ee572732d11b04625b7f517a862"
        },
        {
          "url": "https://git.kernel.org/stable/c/03bee264f8ebfd39e0254c98e112d033a7aa9055"
        }
      ],
      "title": "KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45987",
    "datePublished": "2026-05-27T12:55:38.653Z",
    "dateReserved": "2026-05-13T15:03:33.090Z",
    "dateUpdated": "2026-06-14T17:46:36.929Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


Loading…

Loading…