CVE-2026-53039: ocfs2: validate group add input before caching

highCVSS 7.8CVE-2026-53039

CSIRTS triage

Other

What: The ocfs2 filesystem needs to validate group add input before caching.
Who is affected: Users of the ocfs2 filesystem are affected.
Urgency: High urgency due to the potential for exploitation, although it is not currently exploited.
Action: Implement the recommended patches as soon as they are available.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53039

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-2026-530390.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53039	coverage & exploitation status	NVD · CVE.org

Recent advisories for ocfs2

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-2026-53041: ocfs2: fix listxattr handling when the buffer is fullmsrc · 2026-06-09