Review reviewHigh

CVE-2025-40266

Linux

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.

CVSS: 8.2
EPSS: 0.15%
CISA KEV: Not listed
Published: 2025.12.05

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.15%

Technical severityCVSS 8.2

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 6211753fdfd05af9e08f54c8d0ba3ee516034878 < fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041, >= 6211753fdfd05af9e08f54c8d0ba3ee516034878 < bc1909ef38788f2ee3d8011d70bf029948433051, >= 6211753fdfd05af9e08f54c8d0ba3ee516034878 < f9f1aed6c8a3427900da3121e1868124854569c3, >= 6211753fdfd05af9e08f54c8d0ba3ee516034878 < 103e17aac09cdd358133f9e00998b75d6c1f1518, >= 3.11
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE: Not available