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CVE-2026-45955md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout

Description

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.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-45955, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVDNVD · Modified3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
EPSS (exploitation in 30 days)
0.12% · top 98% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

  • Linux · Linux

    • affected 5ab829f1971dc99f2aac10846c378e67fc875abc – < 095417d6b669c2dec39a5842ccb94df915f97f54
    • affected 5ab829f1971dc99f2aac10846c378e67fc875abc – < 2446d099350185caeed19ab2c0270451a97296fb
    • affected 5ab829f1971dc99f2aac10846c378e67fc875abc – < d119bd2e1643cc023210ff3c6f0657e4f914e71d

  • Linux · Linux

    • affected 6.18
    • unaffected < 6.18
    • unaffected 6.18.14 – ≤ 6.18.*
    • unaffected 6.19.4 – ≤ 6.19.*
    • unaffected 7.0 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .