CVE-2026-63796: ocfs2: reject oversized group bitmap descriptors

highCVSS 7.1CVE-2026-63796

CSIRTS triage

What: A fix to reject oversized group bitmap descriptors in ocfs2.
Who is affected: Users of ocfs2 may be affected.
Urgency: Remediation urgency is unclear due to the unknown severity of the issue.
Action: Monitor for updates related to CVE-2026-63796.

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 7.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63796

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-2026-637960.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63796	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

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-2026-63796: In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject oversized gr…nvd · 2026-07-19
highCVE-2026-53039: ocfs2: validate group add input before cachingmsrc · 2026-06-09
highCVE-2026-53041: ocfs2: fix listxattr handling when the buffer is fullmsrc · 2026-06-09