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util-linux mount(8) EUVDEUVD-2026-70106

| CVE-2026-78410 HIGH
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-09-02 redhat
Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Suse Red Hat Hardened Images Red Hat
7.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

AC:H reflects the inherent timing dependency of the TOCTOU race; all other metrics follow from the description - local access (AV:L), unprivileged user (PR:L), and full impact via chown/chmod redirect (C:H/I:H/A:H).

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
POC Analysis Generated
Sep 08, 2026 - 23:29 vuln.today
Metadata Corrected
Sep 02, 2026 - 16:40 vuln.today
tag: Information Disclosure replaced by Privilege Escalation
Analysis Generated
Sep 02, 2026 - 16:02 vuln.today
CVE Published
Sep 02, 2026 - 15:05 cve.org
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

Local privilege escalation in util-linux's SUID mount(8) binary exposes all major Red Hat Enterprise Linux versions (7-10), Red Hat Hardened Images, and OpenShift Container Platform 4 to root-level file ownership and permission manipulation by low-privileged local users. The flaw stems from a time-of-check to time-of-use (TOCTOU) race: mount(8) reads the bind-mount source from fstab but does not pin the resolved inode before issuing the privileged syscall, allowing an attacker with write access to the source path or a writable ancestor to substitute an arbitrary host directory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The attacker must have a local unprivileged account with shell access (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is plausible for the worst-case scenario, but the AC:L rating merits scrutiny - TOCTOU races are inherently timing-dependent and many comparable vulnerabilities are classified AC:H; even a mid-sized municipal IT team in mielec managing RHEL infrastructure should treat this as a high-priority patch but can reasonably expect exploitation to require sustained local effort rather than instant one-shot execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply vendor-supplied util-linux package updates from Red Hat for RHEL 7-10, Red Hat Hardened Images, and OpenShift Container Platform 4 by consulting https://access.redhat.com/security/cve/CVE-2026-78410; no specific fixed package version is available from the input data, so monitor that advisory actively. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all RHEL 7-10 and OpenShift Container Platform 4 systems in your environment; audit fstab configurations on identified systems for entries using X-mount.owner, X-mount.group, or X-mount.mode options, as these trigger the privilege escalation chain. …

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Vendor StatusVendor

SUSE

Severity: Important
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EUVD-2026-70106 vulnerability details – vuln.today
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