KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

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Summary

CVECVE-2026-46032
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:22 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit() returns an error code that is ignored by most callers, and continues to run L1 with corrupted state. A sane recovery is not possible in this case, and HW behavior is to cause a shutdown. Inject a triple fault instead, and do not return early from nested_svm_vmexit(). Continue cleaning up the vCPU state (e.g. clear pending exceptions), to handle the failure as gracefully as possible. From the APM: Upon #VMEXIT, the processor performs the following actions in order to return to the host execution context: ... if (illegal host state loaded, or exception while loading host state) shutdown else execute first host instruction following the VMRUN Remove the return value of nested_svm_vmexit(), which is mostly unchecked anyway.

Risk And Classification

EPSS: 0.000190000 probability, percentile 0.056320000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d82aaef9c88aa27bce63751d6d6329920b1fe8da 9a738cf170a4a2332ea3a15e23ec65b5757fe4a1 git Not specified
CNA Linux Linux affected d82aaef9c88aa27bce63751d6d6329920b1fe8da 5d291ef0585ed880ed4dd71ea1a5965e0a65fb53 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 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/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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