CVE-2026-53381: virtiofs: fix UAF on submount umount

highCVSS 8.1CVE-2026-53381

CSIRTS triage

product: virtiofsOther

What: A use-after-free vulnerability has been identified in the submount umount process.
Who is affected: Users of virtiofs are potentially affected by this vulnerability.
Urgency: Remediation is advised due to the unknown severity of the vulnerability.
Action: Update virtiofs to the latest version to fix this issue.

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: high — CVSS 8.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53381

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-2026-533810.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53381	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 virtiofs

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-2026-53381: In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix UAF on submo…nvd · 2026-07-19