CVE-2026-23355: Linux kernel · ata: libata: cancel pending work after clearing deferred_qc
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9 : update Linux kernel when convenient.
Data as of 30 Oct 2026, 12:49 UTC
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
Disclosed: evidence found.
CVE published 25 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
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
- git.kernel.org/stable/c/0d12453818c35e1ded84633152c6b05002ae48b9 (opens in a new tab)
- git.kernel.org/stable/c/6c5e8f16b5e8e614e829aaf38619bdd79107bb0a (opens in a new tab)
- git.kernel.org/stable/c/58e658763ba2aa9168d8516b98a6314d7461a53e (opens in a new tab)
- git.kernel.org/stable/c/aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9 (opens in a new tab)