CVE-2025-40266
KVM: arm64: Check the untrusted offset in FF-A memory share
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.
INFO
Published Date :
Dec. 4, 2025, 4:16 p.m.
Last Modified :
July 30, 2026, 6:24 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the Linux kernel patch for KVM.
- Verify untrusted offset values in memory sharing.
- Ensure proper bounds checking for FF-A buffers.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40266.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40266 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40266
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40266 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40266 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6211753fdfd05af9e08f54c8d0ba3ee516034878', 'lessThan': 'fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041', 'versionType': 'git'}, {'status': 'affected', 'version': '6211753fdfd05af9e08f54c8d0ba3ee516034878', 'lessThan': 'bc1909ef38788f2ee3d8011d70bf029948433051', 'versionType': 'git'}, {'status': 'affected', 'version': '6211753fdfd05af9e08f54c8d0ba3ee516034878', 'lessThan': 'f9f1aed6c8a3427900da3121e1868124854569c3', 'versionType': 'git'}, {'status': 'affected', 'version': '6211753fdfd05af9e08f54c8d0ba3ee516034878', 'lessThan': '103e17aac09cdd358133f9e00998b75d6c1f1518', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/ffa.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.118', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.60', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.17.10', 'versionType': 'semver', 'lessThanOrEqual': '6.17.*'}, {'status': 'unaffected', 'version': '6.18', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/ffa.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-40266', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-16T19:59:35.285244Z'} -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dec. 04, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518 Added Reference https://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051 Added Reference https://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3 Added Reference https://git.kernel.org/stable/c/fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041