KVM: SEV: Pin source page for write when adding CPUID data for SNP guest

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Summary

CVECVE-2026-64285
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:09 UTC
Updated2026-07-25 10:17:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest When populating a guest_memfd instance with the initial CPUID data for an SNP guest, acquire a writable pin on the source page as KVM will write back the "correct" CPUID information if the userspace provided data is rejected by trusted firmware. Because KVM writes to the source page using a kernel mapping, pinning for read could result in KVM clobbering read-only memory. Note, well-behaved VMMs are unlikely to be affected, as CPUID information is almost always dynamically generated by userspace, i.e. it's unlikely for the CPUID information to be backed by a read-only mapping. [sean: rewrite shortlog and changelog, tag for stable@]

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.097860000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2a62345b30529e488beb6a1220577b3495933724 dcdb476f5fc5701ec06c23efe3e3529f07ca391e git Not specified
CNA Linux Linux affected 2a62345b30529e488beb6a1220577b3495933724 f13e900599089b10113ceb36013423f0837c6792 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dcdb476f5fc5701ec06c23efe3e3529f07ca391e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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