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Vulnerability record · CVE-2026-78410 · published 2 September 2026

CVE-2026-78410: TOCTOU race condition vulnerability

A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.

7.8 CVSS 3.1 High EPSS 0.16% · top 96.0% CWE-367 · TOCTOU race condition Awaiting Analysis
7.8CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
4 Sep 2026Last modified by NVD

Description

A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:63162
https://access.redhat.com/security/cve/CVE-2026-78410
https://bugzilla.redhat.com/show_bug.cgi?id=2522684
https://github.com/util-linux/util-linux/security/advisories/GHSA-rh77-686x-2f2m
https://github.com/util-linux/util-linux/security/advisories/GHSA-rh77-686x-2f2m

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-78410), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.