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.

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Fixes

Solution

No solution given by the vendor.


Workaround

Upgrade to util-linux v2.41.6, v2.42.3, or later. Until a fix is applied, do not allow unprivileged /etc/fstab bind or rbind entries that also specify X-mount.owner, X-mount.group, or X-mount.mode, especially when the bind source is below a user-writable ancestor.

History

Thu, 03 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux util-linux
Redhat hardened Images
Redhat openshift Container Platform
Vendors & Products Linux
Linux util-linux
Redhat hardened Images
Redhat openshift Container Platform

Thu, 03 Sep 2026 13:00:00 +0000

Type Values Removed Values Added
References

Thu, 03 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
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.
Title Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
Weaknesses CWE-367
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-03T12:51:01.307Z

Reserved: 2026-08-24T14:40:20.201Z

Link: CVE-2026-78410

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-02T16:17:23.983

Modified: 2026-09-03T18:12:56.407

Link: CVE-2026-78410

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-02T00:00:00Z

Links: CVE-2026-78410 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T16:27:17Z

Weaknesses