KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12

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Summary

CVECVE-2026-46071
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:28 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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().

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.043360000 (date 2026-05-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d20c796ca3709801f8a7fa36e8770a3dd8ebd34e a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 git Not specified
CNA Linux Linux affected d20c796ca3709801f8a7fa36e8770a3dd8ebd34e 9efe23568806d1cd06f7d146f9b3037b8d585a9f git Not specified
CNA Linux Linux affected d20c796ca3709801f8a7fa36e8770a3dd8ebd34e b53ab5167a81537777ac780bbd93d32613aa3bda git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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