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CVE-2025-40266KVM: arm64: Check the untrusted offset in FF-A memory share
- 8.2HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Affected products
- affected 6211753fdfd05af9e08f54c8d0ba3ee516034878 – < fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041
- affected 6211753fdfd05af9e08f54c8d0ba3ee516034878 – < bc1909ef38788f2ee3d8011d70bf029948433051
- affected 6211753fdfd05af9e08f54c8d0ba3ee516034878 – < f9f1aed6c8a3427900da3121e1868124854569c3
- affected 6211753fdfd05af9e08f54c8d0ba3ee516034878 – < 103e17aac09cdd358133f9e00998b75d6c1f1518
- affected 3.11
- unaffected < 3.11
- unaffected 6.6.118 – ≤ 6.6.*
- unaffected 6.12.60 – ≤ 6.12.*
- unaffected 6.17.10 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References4
- https://git.kernel.org/stable/c/fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041 (opens in a new tab)
- https://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051 (opens in a new tab)
- https://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3 (opens in a new tab)
- https://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201191 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40266)Record last updated .