CVE-2026-88265

A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.

This Moderate flaw in crun allows a non-root container process to write to and change ownership of a host bind-mounted file. Exploitation requires a malicious container image to replace /dev/null with a symlink while /dev is not mounted within the container, indicating specific preconditions for successful attack.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.