CVE-2026-53122: btrfs: fix deadlock between reflink and transaction commit when using flushoncommit

mediumCVSS 5.5CVE-2026-53122

CSIRTS triage

product: btrfsOther

What: A deadlock issue occurs between reflink and transaction commit when using flushoncommit.
Who is affected: Deployments using btrfs are affected.
Urgency: Remediation is medium priority due to the medium severity of the issue.
Action: Apply the fix for CVE-2026-53122.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53122

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-2026-531220.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53122	coverage & exploitation status	NVD · CVE.org

Recent advisories for btrfs

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-53284: In the Linux kernel, the following vulnerability has been resolved: btrfs: only release the di…nvd · 2026-06-26
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