x86/hyperv: Avoid using per-cpu output page in hv_apicid_to_vp_index()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99258
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-03 12:17:32 UTC
Updated2026-11-03 12:17:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/hyperv: Avoid using per-cpu output page in hv_apicid_to_vp_index() hv_apicid_to_vp_index() currently uses the per-cpu hypercall input and output pages. This function is called when running in VTL2 and when running in an SEV-SNP CoCo VM with no paravisor. In the former case, the output page is allocated, but in the latter case it is not, so the hypervisor stores the output VP index in memory that has not been allocated by the guest. Fix this by using the input page for both input and output. The hypercall has very small input and output, so sharing the same page for both is straightforward. An alternative fix is to allocate the per-cpu output page when running in an SEV-SNP CoCo guest, but this uses significantly more memory, particularly with larger vCPUs counts.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3d12349ade541eefde0e71bf5c4aa7aa04c52a79 bdba5f1b8bd0d18b1df61f769b559ed272902489 git Not specified
CNA Linux Linux affected 86c48271e0d60c82665e9fd61277002391efcef7 2b561786c9076a892ef8b8f416c9828bc87ed44f git Not specified
CNA Linux Linux affected 86c48271e0d60c82665e9fd61277002391efcef7 bc8ca0f4769627ae7d04e7ffdbd20de4f27a9bf9 git Not specified
CNA Linux Linux affected 86c48271e0d60c82665e9fd61277002391efcef7 7b74c117e2aac78e0f723e1c9c3644451c56b0d9 git Not specified
CNA Linux Linux affected cb002d6c8f06d6061e84b2109cb84416107a9fb9 git Not specified
CNA Linux Linux affected 6.12.41 6.12.115 semver Not specified
CNA Linux Linux affected 6.15.3 6.16 semver Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bdba5f1b8bd0d18b1df61f769b559ed272902489 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b561786c9076a892ef8b8f416c9828bc87ed44f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7b74c117e2aac78e0f723e1c9c3644451c56b0d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc8ca0f4769627ae7d04e7ffdbd20de4f27a9bf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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