What’s Vulnerable › Vulnerabilities

CVE-2026-78410: Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-10-30
• Weakness: CWE-367

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.

Affected products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Hardened Images: all versions — fixed in 2.42.2-3.4.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 2.42.2-3.4.hum1. Check the vendor advisory for mitigations.

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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