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VulnerabilityPublished Updated

CVE-2026-23355: Linux kernel · ata: libata: cancel pending work after clearing deferred_qc

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:49 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9, 58e658763ba2aa9168d8516b98a6314d7461a53e, 6c5e8f16b5e8e614e829aaf38619bdd79107bb0a +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=6.1.191 <6.2
Fixed in
  • aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9
  • 58e658763ba2aa9168d8516b98a6314d7461a53e
  • 6c5e8f16b5e8e614e829aaf38619bdd79107bb0a
  • 6.2
  • 0d12453818c35e1ded84633152c6b05002ae48b9
LinuxLinuxAffected
  • >=6.19.4 <6.19.7
Fixed in
  • 6.19.7
LinuxLinuxAffected
  • >=6.18.14 <6.18.18
Fixed in
  • 6.18.18

AI-suggested

A fix is available in Linux kernel versions 6.2, 6.19.7, and 6.18.18 and later. Users should update to these or later versions to remediate the issue. No additional mitigation actions are required beyond applying the official kernel updates.

Description

CVE-2026-23355 is a vulnerability in the Linux kernel's libata subsystem related to handling deferred queued commands (QC). The issue arises because pending work to issue deferred QC commands is not canceled after clearing the deferred QC pointer, leading to potential race conditions where stale work runs incorrectly. This flaw was fixed by ensuring that the work is canceled when clearing the deferred QC.

References

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