CVE-2021-30465: Fedoraproject Fedora

High severity, CVSS 8.5. EPSS: 6.6% chance of exploitation in the next 30 days.

runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• Linuxfoundation Runc: up to and including 0.1.1; version 1.0.0 only

Published 2021-05-27. Last modified 2026-06-17.