CVE-2026-52906

kernel: 9p: fix access mode flags being ORed instead of replaced

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Severity

Low

Red Hat Product Security

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CVSS

Review impact separately from score.

Published · June 9, 2026

Updated · October 20, 2026

Description

A flaw was found in the Linux kernel's 9p filesystem. When mounting, access mode flags were incorrectly combined instead of being replaced, leading to an invalid configuration. This issue causes root users to be unable to perform privileged operations like changing file ownership, effectively degrading their privileges and causing a denial of service for these specific actions.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CWE-266 · Incorrect Privilege Assignment