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CVE-2026-53392: NFSv4/flexfiles: reject zero filehandle version count

mediumCVSS 5.5CVE-2026-53392

CSIRTS triage

vendor: Linuxproduct: NFSv4Other
What
NFSv4/flexfiles should reject zero filehandle version count.
Who is affected
Deployments of the Linux kernel using NFSv4/flexfiles.
Urgency
Remediation is necessary to ensure proper NFS operations.
Action
Update to the latest kernel version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53392

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-53392coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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