Answer in brief
CVE-2026-64172 records a Unknown severity vulnerability in KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8de4a1c8164e5b2e40d1df764840a31de983f40b <94ade38f317ea086a181db0e6b69c574b3b70a5e || >=8de4a1c8164e5b2e40d1df764840a31de983f40b <9560e6fee887a9594a89fa265b5b9c79b1591803 || >=8de4a1c8164e5b2e40d1df764840a31de983f40b <9a12fa5213cfc391e0eed63902d3be98f0913765 | 94ade38f317ea086a181db0e6b69c574b3b70a5e, 9560e6fee887a9594a89fa265b5b9c79b1591803, 9a12fa5213cfc391e0eed63902d3be98f0913765 |
| Linux/Linuxgeneric | 6.17 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64172 records a Unknown severity vulnerability in KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8de4a1c8164e5b2e40d1df764840a31de983f40b <94ade38f317ea086a181db0e6b69c574b3b70a5e || >=8de4a1c8164e5b2e40d1df764840a31de983f40b <9560e6fee887a9594a89fa265b5b9c79b1591803 || >=8de4a1c8164e5b2e40d1df764840a31de983f40b <9a12fa5213cfc391e0eed63902d3be98f0913765 | 94ade38f317ea086a181db0e6b69c574b3b70a5e, 9560e6fee887a9594a89fa265b5b9c79b1591803, 9a12fa5213cfc391e0eed63902d3be98f0913765 |
| Linux/Linuxgeneric | 6.17 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.