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CVE-2025-40266

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

HIGH
8.2
CVSS Score
Published: December 4, 2025 at 04:08 PM UTC
Updated: October 18, 2026 at 04:10 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.2
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
3.116211753fdfd05af9e08f54c8d0ba3ee516034878
Vendor states this is fixed in 103e17aac09cdd358133f9e00998b75d6c1f1518 (fixed)
Vendor states this is fixed in bc1909ef38788f2ee3d8011d70bf029948433051 (fixed)
Vendor states this is fixed in f9f1aed6c8a3427900da3121e1868124854569c3 (fixed)
Vendor states this is fixed in fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041 (fixed)
Vendor states this is fixed in 3.11 (unaffected)
Vendor states this is fixed in 6.12.60 (unaffected)
Vendor states this is fixed in 6.17.10 (unaffected)
Vendor states this is fixed in 6.18 (unaffected)
Vendor states this is fixed in 6.6.118 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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