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🛡️ CVE-2025-39763 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered

In the Linux kernel, the following vulnerability has been resolved:

ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered

If a synchronous error is detected as a result of user-space process

triggering a 2-bit uncorrected error, the CPU will take a synchronous

error exception such as Synchronous External Abort (SEA) on Arm64. The

kernel will queue a memory_failure() work which poisons the related

page, unmaps the page, and then sends a SIGBUS to the process, so that

a system wide panic can be avoided.

However, no memory_failure() work will be queued when abnormal

synchronous errors occur. These errors can include situations like

invalid PA, unexpected severity, no memory failure config support,

invalid GUID section, etc. In such a case, the user-space process will

trigger SEA again. This loop can potentially exceed the platform

firmware threshold or even trigger a kernel hard lockup, leading to a

system reboot.

Fix it by performing a force kill if no memory_failure() work is queued

for synchronous errors.

[ rjw: Changelog edits ]

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2025-39763 is recorded against 2 packages.

  • kernel (from 6.16.0 up to 6.16.2)
  • linux-kernel (from 6.16 up to 6.16.2)

Timeline and source

Published on 11 September 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-39763 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-11
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.16.0 6.16.2
linux-kernel 6.16 6.16.2

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