---
id: CVE-2026-45955
title: 'md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout

  When llbitmap_suspend_timeout() times out waiting for percpu_ref to
  become zero, it returns -ETIMEDOU…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc <
    095417d6b669c2dec39a5842ccb94df915f97f54
  - >-
    Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc <
    2446d099350185caeed19ab2c0270451a97296fb
  - >-
    Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc <
    d119bd2e1643cc023210ff3c6f0657e4f914e71d
  - Linux 6.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:18:35.481520Z'
published: '2026-05-27'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:47.494Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-45955'
references:
  - url: 'https://git.kernel.org/stable/c/095417d6b669c2dec39a5842ccb94df915f97f54'
  - url: 'https://git.kernel.org/stable/c/2446d099350185caeed19ab2c0270451a97296fb'
  - url: 'https://git.kernel.org/stable/c/d119bd2e1643cc023210ff3c6f0657e4f914e71d'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05834
ingestedAt: '2026-10-16T17:24:46.701Z'
---

## Overview

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

md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout

When llbitmap_suspend_timeout() times out waiting for percpu_ref to
become zero, it returns -ETIMEDOUT without resurrecting the percpu_ref.
The caller (md_llbitmap_daemon_fn) then continues to the next page
without calling llbitmap_resume(), leaving the percpu_ref in a killed
state permanently.

Fix this by resurrecting the percpu_ref before returning the error,
ensuring the page control structure remains usable for subsequent
operations.

## Affected

- `Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc < 095417d6b669c2dec39a5842ccb94df915f97f54`
- `Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc < 2446d099350185caeed19ab2c0270451a97296fb`
- `Linux >= 5ab829f1971dc99f2aac10846c378e67fc875abc < d119bd2e1643cc023210ff3c6f0657e4f914e71d`
- `Linux 6.18`

## Remediation

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