SB20261023191 - Race condition in Linux kernel fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98980)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose the contents of underlying files normally hidden by overmounted entries.

The vulnerability exists due to improper synchronization in the Linux kernel's reference-based pathname traversal in fs/namei.c when resolving paths concurrently with unlink, rmdir, or rename operations. A local user can race a pathname lookup against an operation that detaches mounts and removes the underlying name to read a covered file if the lookup retains a reference to its dentry but misses the detached mount.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5f97df8ca7fadf5b53954f50073445ba193902c0
• https://git.kernel.org/stable/c/8189ab688f5a2c745dc90b63374da02f213d6994
• https://git.kernel.org/stable/c/b43ff2deef48260bfbdc0dcb520f7929bd3e4007
• https://git.kernel.org/stable/c/e2b10181d913b4efa3a8dc67a532f859aa5f95e0