KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state

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Summary

CVECVE-2026-68081
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-08 10:16:54 UTC
Updated2026-08-08 10:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state Put all vmcs12 pages if KVM synthesizes a nested VM-Exit due to invalid guest while emulating VMLAUNCH or VMRESUME. The invalid guest state path doesn't use nested_vmx_vmexit() as that API is intended to be used if and only if L2 is active, and the open coded equivalent neglects to put the vmcs12 pages. Failure to put the vmcs12 pages leaks any pinned pages (and/or mappings) if L1 retries VMLAUNCH/VMRESUME. Note, the !from_vmenter scenario doesn't suffer the same problem, as vmx_get_nested_state_pages() only gets/pins/maps the vmcs12 pages if L2 is active, i.e. if a "full" VM-Exit is guaranteed before KVM will retry getting vmcs12 pages.

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.108370000 (date 2026-08-08)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 7996013b85687034d2e820cef94d6404192e3a3d git Not specified
CNA Linux Linux affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 2c87a087c20632d68920272173b5d7c47f9bcf70 git Not specified
CNA Linux Linux affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 2f2312c422fd2695da772cecb30c69994b795964 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c87a087c20632d68920272173b5d7c47f9bcf70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7996013b85687034d2e820cef94d6404192e3a3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f2312c422fd2695da772cecb30c69994b795964 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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