SB20261023179 - Use-after-free in Linux kernel fs

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Main Vulnerability Database SB20261023179

SB20261023179 - Use-after-free in Linux kernel fs

Published: October 23, 2026

Security Bulletin ID SB20261023179
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98985)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to trigger a use-after-free read that may cause a denial of service.

The vulnerability exists due to use-after-free in path_pivot_root() in fs/namespace.c when reading mount parents before verifying that the mounts belong to the caller's mount namespace. A local privileged user can invoke pivot_root() with a reference to an unmounted mount while its parent is concurrently released to trigger a read of freed memory, potentially causing a denial of service.

The same invalid parent read can also occur through the caller's root set via chroot().


Remediation

Install update from vendor's website.

References