KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)

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Summary

CVECVE-2026-64172
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:59 UTC
Updated2026-07-19 16:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235) Hygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and share the same erratum #1235: hardware may read a stale IsRunning=1 bit during ICR write emulation and silently fail to generate an AVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU. The absence of the VM-Exit causes KVM to miss the required wakeup of blocking target vCPUs, leading to hung vCPUs and unbounded delays in guest execution. Extend the existing AMD Family 17h erratum #1235 workaround to also cover Hygon Family 18h. With IPI virtualization disabled, KVM never sets IsRunning=1 in the Physical ID table, so every non-self IPI generates a VM-Exit and is correctly emulated.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 94ade38f317ea086a181db0e6b69c574b3b70a5e git Not specified
CNA Linux Linux affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 9560e6fee887a9594a89fa265b5b9c79b1591803 git Not specified
CNA Linux Linux affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 9a12fa5213cfc391e0eed63902d3be98f0913765 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/94ade38f317ea086a181db0e6b69c574b3b70a5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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