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

Q: What level of access is required to trigger this issue?

The CVSS vector indicates local access and low privileges are required. No user interaction is required.

Q: What is the likely operational impact if the issue is triggered?

A dquot lock can remain held, causing lock leaks or deadlocks during later quota operations. The CVSS assessment rates availability impact as high, with no stated confidentiality or integrity impact.

Q: What should be done if the affected kernel is in use?

Apply an available patch. The provided data does not identify an alternative mitigation if patching cannot be performed immediately.

Q: How might an affected system present operationally?

Later quota operations may encounter lock leaks or deadlocks after the affected quota scrub path is exercised. No specific detection procedure is provided.

Published Apr 24, 2026

Updated

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

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

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

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

Affected Software

12 affected components

Linux Linux kernel

Linux Linux kernel>=6.8.1<6.12.80

Linux Linux kernel>=6.13<6.18.21

Linux Linux kernel>=6.19<6.19.11

Linux Linux kernel=6.8

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

Linux Linux kernel=7.0-rc7

Remediation

Event History

Apr 24, 2026

CVE Published

via MITRE·02:35 PM

Data Sourced

via MITRE·02:35 PM

Description

Data Sourced

via NVD·03:16 PM

RemedyDescriptionSeverityAffected Software

Frequently Asked Questions

What level of access is required to trigger this issue?

The CVSS vector indicates local access and low privileges are required. No user interaction is required.

What is the likely operational impact if the issue is triggered?

A dquot lock can remain held, causing lock leaks or deadlocks during later quota operations. The CVSS assessment rates availability impact as high, with no stated confidentiality or integrity impact.

What should be done if the affected kernel is in use?

Apply an available patch. The provided data does not identify an alternative mitigation if patching cannot be performed immediately.

How might an affected system present operationally?

Later quota operations may encounter lock leaks or deadlocks after the affected quota scrub path is exercised. No specific detection procedure is provided.

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

Affected Software

Remediation

Patch Available

Patch Available

Patch Available

Patch Available

Event History

Frequently Asked Questions

What level of access is required to trigger this issue?

What is the likely operational impact if the issue is triggered?

What should be done if the affected kernel is in use?

How might an affected system present operationally?

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Resources

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Frequently Asked Questions

What level of access is required to trigger this issue?

What is the likely operational impact if the issue is triggered?

What should be done if the affected kernel is in use?

How might an affected system present operationally?