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CVE-2026-78410

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

Published: Sep 2, 2026Updated: Sep 4, 2026 Sources: CVE List NVDCWE-367
7.8HIGH
NVD MITRE
EPSS Score
0.1%
Top 99.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-367

Affected Products

Red Hat
commercial·US
Red Hat Hardened ImagesOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 10On-premOS
Operating Systems / linux-distro
Red Hat OpenShift Container Platform 4SaaSSaaS Service
Cloud & SaaS / container-orchestration
and 3 more affected products View all →

Exploitability

Workaround Available
Is your org exposed to CVE-2026-78410?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:63162
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-78410
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2522684
bugzilla.redhat.com
and 1 more references View all →
News mentions
1

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