Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
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
FAQ
What is CVE-2026-78410?
CVE-2026-78410 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-78410?
CVE-2026-78410 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-78410?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.