CVE-2026-78410

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

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

CWE

CWE-367

Published

2026-09-02

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

References

• 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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