CVE-2026-74619: ovl: don't warn when the mount is completed from another user namespace

mediumCVSS 5.5CVE-2026-74619

CSIRTS triage

vendor: Linux product: LinuxOther

What: Overlay filesystem generates spurious warnings when mount completion occurs from a different user namespace.
Who is affected: Linux systems using overlay filesystems with user namespace isolation.
Urgency: Low; CVSS 5.5 and warning-only impact; fix at next scheduled maintenance.
Action: Apply kernel patch or upgrade to suppress spurious overlay mount warnings.

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: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74619

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-2026-746190.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74619	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 ovl

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.

unknownCVE-2026-74619: In the Linux kernel, the following vulnerability has been resolved: ovl: don't warn when the m…nvd · 2026-08-22
unknownCVE-2026-68448: In the Linux kernel, the following vulnerability has been resolved: ovl: check access to copy_…nvd · 2026-08-12
mediumCVE-2026-68448: ovl: check access to copy_file_range source with src mounter credsmsrc · 2026-08-11