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🛡️ CVE-2025-40266 — kernel

🟠 CVSS 8.2 — High ✅ No Known Exploit NVD
8.2
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

KVM: arm64: Check the untrusted offset in FF-A memory share

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2025-40266 is recorded against 3 packages.

  • :linux-kernel: (from :0 up to :2026-03-05)
  • kernel (from 6.13.0 up to 6.17.10)
  • unknown

Timeline and source

Published on 1 March 2026 and last revised on 20 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

source.android.com (Advisory)
android.googlesource.com (Fix)
android.googlesource.com (Fix)
android.googlesource.com (Fix)

Other advisories for this package

:linux-kernel: has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity High
CVSS Score 8.2
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-03-01
Updated 2026-08-20
Modified 2026-08-20

Affected Packages

Software From version Fixed in
:linux-kernel: :0 :2026-03-05
kernel 6.13.0 6.17.10
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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