CVE-2026-78410
Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-367 |
| Vendor | red hat |
| Product | red hat hardened images |
| Published | Sep 2, 2026 |
| Last Updated | Sep 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:63162 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-78410 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2522684 github.com: https://github.com/util-linux/util-linux/security/advisories/GHSA-rh77-686x-2f2m
Credits
Upstream acknowledges Zhuorao Yang (Huawei Cloud) as the original reporter.