# CVE-2026-31556: xfs: scrub: unlock dquot before early return in quota scrub

Status: published. Published: 2026-04-24. Updated: 2026-11-05.

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

xfs: scrub: unlock dquot before early return in quota scrub

xchk_quota_item can return early after calling xchk_fblock_process_error.
When that helper returns false, the function returned immediately without
dropping dq->q_qlock, which can leave the dquot lock held and risk lock
leaks or deadlocks in later quota operations.

Fix this by unlocking dq->q_qlock before the early return.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 7d1f0e167a067ed741dec08b7614d76893422b04; < e822f535273af0e8968eab7acc0cea0b90dd25af (affected, git); ≥ 7d1f0e167a067ed741dec08b7614d76893422b04; < 3b0c3414b308e6822cda90bf99f7eac94d4cca2b (affected, git); ≥ 7d1f0e167a067ed741dec08b7614d76893422b04; < d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f (affected, git); ≥ 7d1f0e167a067ed741dec08b7614d76893422b04; < 268378b6ad20569af0d1957992de1c8b16c6e900 (affected, git). Source: CNA: Linux
- Linux / Linux: 6.8 (affected); ≥ 0; < 6.8 (unaffected, semver); ≥ 6.12.80; ≤ 6.12.* (unaffected, semver); ≥ 6.18.21; ≤ 6.18.* (unaffected, semver); ≥ 6.19.11; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.12% as of 2026-11-05; percentile 1.98%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af (CNA: Linux)

- https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b (CNA: Linux)

- https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f (CNA: Linux)

- https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31556; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31556; retrieved 2026-11-05; source updated Not reported

Revision: b032902b053a6bc24af7d309287b2ae0c258d65b3016a1dedae573bc64bcf0e2

Canonical: https://y2.dev/cve/CVE-2026-31556

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