---
id: CVE-2025-39763
title: >-
  ACPI: APEI: send SIGBUS to current task if synchronous memory error not
  recovered
summary: >-
  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-b…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    2fbc85da9ac9386bd89fcc94e0aadaea19d47784
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    082735fbcdb6cd0cf20fbec94516ab2996f1cdd5
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    af089e41811a1ad6a7b2b80e839a73ec4c3cecdd
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    3cb4f18797247985b0f51d5300f8cb6c78f343ea
  - >-
    Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <
    79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060
  - Linux af02933d59bd1621a48d8b0b331cca9e530ba14b
  - Linux >= 5.4.69 < 5.5
  - Linux 5.8
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:10:59.269892Z'
published: '2025-09-11'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:12:57.142Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-39763'
references:
  - url: 'https://git.kernel.org/stable/c/2fbc85da9ac9386bd89fcc94e0aadaea19d47784'
  - url: 'https://git.kernel.org/stable/c/082735fbcdb6cd0cf20fbec94516ab2996f1cdd5'
  - url: 'https://git.kernel.org/stable/c/cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1'
  - url: 'https://git.kernel.org/stable/c/af089e41811a1ad6a7b2b80e839a73ec4c3cecdd'
  - url: 'https://git.kernel.org/stable/c/3cb4f18797247985b0f51d5300f8cb6c78f343ea'
  - url: 'https://git.kernel.org/stable/c/79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060'
tags:
  - cve.org
epss: 0.0016
epssPercentile: 0.05166
ingestedAt: '2026-11-05T22:38:32.035Z'
---

## Overview

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 ]

## Affected

- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 2fbc85da9ac9386bd89fcc94e0aadaea19d47784`
- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 082735fbcdb6cd0cf20fbec94516ab2996f1cdd5`
- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1`
- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < af089e41811a1ad6a7b2b80e839a73ec4c3cecdd`
- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 3cb4f18797247985b0f51d5300f8cb6c78f343ea`
- `Linux >= 8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 < 79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060`
- `Linux af02933d59bd1621a48d8b0b331cca9e530ba14b`
- `Linux >= 5.4.69 < 5.5`
- `Linux 5.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.