CVE-2026-31556: Linux kernel · xfs: scrub: unlock dquot before early return in quota scrub
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e822f535273af0e8968eab7acc0cea0b90dd25af : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:06 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in e822f535273af0e8968eab7acc0cea0b90dd25af, d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f, 268378b6ad20569af0d1957992de1c8b16c6e900 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Apr 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 5 Nov 2026.
What to do
Upgrade Linux kernel to e822f535273af0e8968eab7acc0cea0b90dd25af, d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f, 268378b6ad20569af0d1957992de1c8b16c6e900 or 3b0c3414b308e6822cda90bf99f7eac94d4cca2b.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel. Users should update to the fixed versions identified by the commits e822f535273af0e8968eab7acc0cea0b90dd25af, d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f, 268378b6ad20569af0d1957992de1c8b16c6e900, and 3b0c3414b308e6822cda90bf99f7eac94d4cca2b. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's XFS filesystem quota scrub functionality could cause a dquot lock to remain held due to an early return in the xchk_quota_item function. This improper unlocking may lead to lock leaks or deadlocks during subsequent quota operations. The issue has been fixed by ensuring the dquot lock is released before the early return.
References
- git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af (opens in a new tab)
- git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b (opens in a new tab)
- git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f (opens in a new tab)
- git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900 (opens in a new tab)