Answer in brief
CVE-2025-40266 records a High severity (CVSS 8.2) vulnerability in KVM: arm64: Check the untrusted offset in FF-A memory share. 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.
CVSS is 8.2. 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 | >=6211753fdfd05af9e08f54c8d0ba3ee516034878 <fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041 || >=6211753fdfd05af9e08f54c8d0ba3ee516034878 <bc1909ef38788f2ee3d8011d70bf029948433051 || >=6211753fdfd05af9e08f54c8d0ba3ee516034878 <f9f1aed6c8a3427900da3121e1868124854569c3 || >=6211753fdfd05af9e08f54c8d0ba3ee516034878 <103e17aac09cdd358133f9e00998b75d6c1f1518 | fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041, bc1909ef38788f2ee3d8011d70bf029948433051, f9f1aed6c8a3427900da3121e1868124854569c3, 103e17aac09cdd358133f9e00998b75d6c1f1518 |
| Linux/Linuxgeneric | 3.11 | Not reported |
Published upstream
Dec 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 18, 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: arm64: Check the untrusted offset in FF-A memory share Verify the offset to prevent OOB access in the hypervisor FF-A buffer in case an untrusted large enough value [U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX] is set from the host kernel.
Quoted source text, attributed separately from HOL analysis.