Reliance on Untrusted Inputs in a Security Decision in Util-linux - CVE-2026-53614
Published: September 2, 2026
Vulnerability identifier: #VU146716
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53614
CWE-ID: CWE-807
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to reliance on untrusted environment variables in libmount mount path selection when processing the LIBMOUNT_FORCE_MOUNT2 environment variable in the SUID mount(8) binary. A local user can set LIBMOUNT_FORCE_MOUNT2=always and trigger concurrent mount operations to escalate privileges.
Exploitation requires an /etc/fstab bind entry with user, nosuid, and noexec options where the bind source contains a SUID root binary.
Affected software
Util-linux
Fedora
util-linux
Fedora
util-linux
How to mitigate CVE-2026-53614
Install security update from vendor's website.
Util-linux - addressed in versions 2.41.5, 2.42.2
util-linux - addressed in versions 2.41.5-1.fc43, 2.41.5-1.fc44
util-linux - addressed in versions 2.41.5-1.fc43, 2.41.5-1.fc44