KVM: SEV: Free have_run_cpus during VM destruction even if VM is no longer SEV

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Summary

CVECVE-2026-98472
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:16:57 UTC
Updated2026-10-19 10:18:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Free have_run_cpus during VM destruction even if VM is no longer SEV Unconditionally free SEV's "have run CPUs" cpumask in the VM destroy path, i.e. even for what appear to be non-SEV VMs, as an SEV VM becomes a non-SEV VM if its state is intra-host migrated. Alternatively, the mask could be freed in sev_migrate_from() when "converting" the source VM, but that gets annoying because ideally KVM would nullify the mask to guard against UAF, and nullifying the mask would need be conditioned on CPUMASK_OFFSTACK=y. Freeing the mask during sev_migrate_from() is also not robust against other KVM bugs, though that's kind of a moot point since any such bugs would show up even if sev->active is never set. I.e. KVM must get that side of things correct. But, that's not a great reason to add more code just to make things marginally less robust.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6f38f8c574642a822f2e85f079fa29a49176c49c 6aef7cf800098749ff5d660222efaf6e01e98c09 git Not specified
CNA Linux Linux affected 6f38f8c574642a822f2e85f079fa29a49176c49c 9784e5ca91b37b387f3f414af4340c54f7a63566 git Not specified
CNA Linux Linux affected 6f38f8c574642a822f2e85f079fa29a49176c49c 12c1f6e03f944e399bd2c88441dca5dc702b95a5 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9784e5ca91b37b387f3f414af4340c54f7a63566 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6aef7cf800098749ff5d660222efaf6e01e98c09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12c1f6e03f944e399bd2c88441dca5dc702b95a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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