Skip to main content

util-linux mount(8) CVE-2026-78410

| EUVDEUVD-2026-70106 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
Share

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. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Persist
technique details hidden
Impact
technique details hidden
Sign in to reveal

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.
Sign in to read full assessment

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. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Red Hat Enterprise Linux 10

View all
CVE-2026-18663 MEDIUM
5.9 Aug 12

Heap corruption via double-free in 389-ds-base's LDAP control parsing allows an unauthenticated remote attacker to crash
CVE-2026-4631 CRITICAL POC
9.8 Apr 07

Remote code execution in Cockpit's web interface allows unauthenticated attackers to execute arbitrary commands on the h
CVE-2026-4480 CRITICAL POC
9.0 May 26

Remote code execution in Samba's printing subsystem allows remote attackers to inject arbitrary shell commands via craft
CVE-2026-18922 CRITICAL
9.8 Sep 07

Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo
CVE-2026-14544 CRITICAL
9.8 Jul 03

Remote code execution and privilege escalation in HPLIP (HP Linux Imaging and Printing) affects the hpcups print filter

CVE-2026-76578 CRITICAL
9.8 Sep 07

Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a
CVE-2026-5121 HIGH
7.5 Mar 30

Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe
CVE-2026-28369 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel

CVE-2026-28368 CRITICAL
9.1 Mar 27

HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls
CVE-2026-33845 CRITICAL
9.1 Apr 30

Out-of-bounds read in the GnuTLS DTLS handshake reassembly logic lets remote unauthenticated attackers trigger an intege
CVE-2026-28367 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator
CVE-2026-16526 HIGH
8.8 Jul 30

Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Containe

Same weakness CWE-367 – Time-of-check Time-of-use (TOCTOU) Race Condition

View all
CVE-2024-30088 HIGH POC
7.0
CVE-2025-22224 CRITICAL
9.3
CVE-2025-38352 HIGH POC
7.8
CVE-2022-48618 HIGH
7.0
CVE-2023-38146 HIGH POC
8.8
CVE-2025-34027 CRITICAL POC
10.0
CVE-2020-1337 HIGH POC
7.8
CVE-2026-25641 CRITICAL POC
10.0

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Affected
SLES15-SP6-CHOST-BYOS Affected
SLES15-SP6-CHOST-BYOS-Aliyun Affected
SLES15-SP6-CHOST-BYOS-Azure Affected
SLES15-SP6-CHOST-BYOS-EC2 Affected

Share

CVE-2026-78410 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy