Missing Release of File Descriptor or Handle after Effective Lifetime Affecting util-linux-core package, versions <0:2.40.2-18.el10_2.20


Severity

Recommended
0.0
high
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-ALMALINUX10-UTILLINUXCORE-22149371
  • published3 Nov 2026
  • disclosed2 Nov 2026

Introduced: 2 Nov 2026

NewCVE-2026-78408  (opens in a new tab)
CWE-775  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:10 util-linux-core to version 0:2.40.2-18.el10_2.20 or higher.
This issue was patched in ALSA-2026:93461.

NVD Description

Note: Versions mentioned in the description apply only to the upstream util-linux-core package and not the util-linux-core package as distributed by AlmaLinux. See How to fix? for AlmaLinux:10 relevant fixed versions and status.

The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.

CVSS Base Scores

version 3.1