CVE-2026-64172 - KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)

CVE-2026-64172 - KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)

https://cvefeed.io/rssfeed/latest.atom / Sun, 07/19/2026 - 22:06
CVE ID :CVE-2026-64172
Published : July 19, 2026, 4:17 p.m. | 2 hours, 31 minutes ago
Description :In 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.
Severity: 0.0 | NA
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