CVE-2025-40266
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.
Affected versions
Linux kernel versions
3.11
and later are affected. Fixed in
6.6.118,
6.12.60,
6.17.10,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40266 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518
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PatchKernel patch commithttps://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051
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PatchKernel patch commithttps://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3
Frequently asked questions
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What is CVE-2025-40266?
CVE-2025-40266 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.11 onward and has been patched in 6.6.118, 6.12.60, 6.17.10 and others. CVE-2025-40266 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40266?
Yes — CVE-2025-40266 has been patched. Fixed versions include 6.6.118, 6.12.60, 6.17.10 and others. If you are running Linux kernel 3.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40266 actively exploited?
No — CVE-2025-40266 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.