KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

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Summary

CVECVE-2026-98863
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:40 UTC
Updated2026-10-19 10:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the nested pages fails in the KVM_RUN path. If userspace re-runs the vCPU, and vmcs02 holds valid PFNs from the *previous* run of L2, then KVM could re-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page. Note, both SVM and VMX (as of commit 11722439fb20 ("KVM: nVMX: Ensure KVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit") ensure the request is cleared on VM-Exit (including the "forced" case), i.e. there is no risk of double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request trying to map the nested pages.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 671ddc700fd08b94967b1e2a937020e30c838609 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 git Not specified
CNA Linux Linux affected 671ddc700fd08b94967b1e2a937020e30c838609 942192dbcd3a06695ef6b31cf10a41a21cf014d8 git Not specified
CNA Linux Linux affected 671ddc700fd08b94967b1e2a937020e30c838609 10180a277549339020b08000206092c07e0bff5a git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 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/10180a277549339020b08000206092c07e0bff5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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