Input validation error in crun - CVE-2026-30892

Vulnerability identifier: #VU128071

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-30892

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to incorrect option parsing in make_oci_process_user() when processing the crun exec -u (--user) option. A local user can supply a crafted user value to escalate privileges.

The value 1 is interpreted as UID 0 and GID 0 instead of UID 1 and GID 0, causing the process to run with higher privileges than intended.

crun
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
crun (Red Hat package)
Red Hat OpenShift Container Platform

Install security update from vendor's website.

crun - update to 1.27
crun (Red Hat package) - addressed in versions 1.27-1.el9_6, 1.27-1.el9_7, 1.27-1.el10_1
Red Hat OpenShift Container Platform - update to 4.19.37

• https://github.com/containers/crun/security/advisories/GHSA-4vg2-xjqj-7chj

• Red Hat Enterprise Linux 9 update for crun
• Red Hat Enterprise Linux 10 update for crun
• Improper input validation in Container project crun
• Red Hat Enterprise Linux 9 update for crun
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.19