CVE-2026-46071 (GCVE-0-2026-46071)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-06-14 17:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().
References
Impacted products
Vendor Product Version
Linux Linux Version: d20c796ca3709801f8a7fa36e8770a3dd8ebd34e
Version: d20c796ca3709801f8a7fa36e8770a3dd8ebd34e
Version: d20c796ca3709801f8a7fa36e8770a3dd8ebd34e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/nested.c",
            "arch/x86/kvm/svm/svm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a3f0981a5a0e0bd51ad74cc7d9eed32294b24002",
              "status": "affected",
              "version": "d20c796ca3709801f8a7fa36e8770a3dd8ebd34e",
              "versionType": "git"
            },
            {
              "lessThan": "9efe23568806d1cd06f7d146f9b3037b8d585a9f",
              "status": "affected",
              "version": "d20c796ca3709801f8a7fa36e8770a3dd8ebd34e",
              "versionType": "git"
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              "status": "affected",
              "version": "d20c796ca3709801f8a7fa36e8770a3dd8ebd34e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/nested.c",
            "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": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.27",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Avoid clearing VMCB_LBR in vmcb12\n\nsvm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB.\nHowever, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and\nclearing clean bits in vmcb12 is not architecturally defined.\n\nMove vmcb_mark_dirty() to callers and drop it for vmcb12.\n\nThis also facilitates incoming refactoring that does not pass the entire\nVMCB to svm_copy_lbrs()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:52:10.514Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002"
        },
        {
          "url": "https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda"
        }
      ],
      "title": "KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46071",
    "datePublished": "2026-05-27T12:57:57.316Z",
    "dateReserved": "2026-05-13T15:03:33.095Z",
    "dateUpdated": "2026-06-14T17:52:10.514Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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