KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified

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Summary

CVECVE-2026-98720
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:25 UTC
Updated2026-10-19 10:19:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified Force a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the runtime eVMCS controls (pin, primary, secondary, etc.) are being updated. If L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and then runs the same L2 with TPR virtualization disabled, KVM will fail to refresh msr_bitmap02 and leave TPR in passthrough mode even though TPR virtualization is disabled. I.e. failure to refresh the bitmap lets L2 (or L1 by proxy) read and write L0's TPR.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 2db11598b59f16ddb6420693f9a4ac4efc3d4789 git Not specified
CNA Linux Linux affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a git Not specified
CNA Linux Linux affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 1e497e3bdab6983deb68a1d26b488027deb4527f git Not specified
CNA Linux Linux affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 2abb25273c82061dd4670690c81c319c03740bf6 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2abb25273c82061dd4670690c81c319c03740bf6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e497e3bdab6983deb68a1d26b488027deb4527f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2db11598b59f16ddb6420693f9a4ac4efc3d4789 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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