CVE-2026-80534: xfs: fix ilock leak on error in xfs_dq_get_next_id

CSIRTS triage

What

XFS dquota code leaks inode locks on error paths in xfs_dq_get_next_id(), causing potential deadlock.

Who is affected

XFS-based systems with quota management operations.

Urgency

Medium priority; denial of service via resource exhaustion, not exploited.

Action

Update kernel to patched version.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 5.5

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80534

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-805340.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• high[NEW] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
• unknownCVE-2026-80534: In the Linux kernel, the following vulnerability has been resolved: xfs: fix ilock leak on err…nvd

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