KVM: x86: Fix shadow paging use-after-free due to unexpected role

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Summary

CVECVE-2026-53359
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-04 12:17:01 UTC
Updated2026-07-04 12:17:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the GFN of the struct kvm_mmu_page. A similar hole however remains if the modified PDE points to a non-leaf page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However, kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page. The next step is installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn() computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or sp->gfns[] in older kernels). It therefore fails to remove the recorded entry. When the memslot is dropped the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies in the freed page, causing the use-after-free.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 b1337aae5e194324e4810d561764e7793f8b3864 git Not specified
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 9291654d69e08542de37755cebe4d5b02c3170d1 git Not specified
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 2ad3afa40ac6aa340dada122f9abfa46c0a6eb35 git Not specified
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 5e470998a23e4c3d89ed24e8172cb22747e61efa git Not specified
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 1ae7d5a6db6c190ce183e3098ca0e0846e14d462 git Not specified
CNA Linux Linux affected 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb git Not specified
CNA Linux Linux affected 2.6.36 Not specified
CNA Linux Linux unaffected 2.6.36 semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 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/9291654d69e08542de37755cebe4d5b02c3170d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e470998a23e4c3d89ed24e8172cb22747e61efa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b1337aae5e194324e4810d561764e7793f8b3864 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ae7d5a6db6c190ce183e3098ca0e0846e14d462 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ad3afa40ac6aa340dada122f9abfa46c0a6eb35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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