========================================================================== Ubuntu Security Notice USN-7851-1 November 04, 2025
runc-app, runc-stable vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 25.04 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in runC. Software Description: - runc-app: Open Container Project - runc-stable: Open Container Project Details: Lei Wang and Li Fubang discovered that runC incorrectly handled masked paths. An attacker could possibly replace a container's /dev/null with a symlink to some other procfs file and possibly escape a container. (CVE-2025-31133) Lei Wang and Li Fubang discovered that runC incorrectly handled the /dev/console bind-mounts. An attacker could potentially exploit this issue to build-mount a symlink and escape a container. (CVE-2025-52565) Li Fubang and Tõnis Tiigi discovered that the fix for CVE-2019-16884 was incomplete. An attacker could possibly use this issue to cause a denial of service or escape the container. (CVE-2025-52881) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 runc 1.3.3-0ubuntu1~25.10.2 runc-stable 1.3.3-0ubuntu1~25.10.2 Ubuntu 25.04 runc 1.3.3-0ubuntu1~25.04.2 Ubuntu 24.04 LTS runc 1.3.3-0ubuntu1~24.04.2 Ubuntu 22.04 LTS runc 1.3.3-0ubuntu1~22.04.2 This update uses a new upstream release, which includes additional bug fixes. In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7851-1 CVE-2025-31133, CVE-2025-52565, CVE-2025-52881 Package Information: https://launchpad.net/ubuntu/+source/runc-app/1.3.3-0ubuntu1~25.10.2 https://launchpad.net/ubuntu/+source/runc-stable/1.3.3-0ubuntu1~25.10.2 https://launchpad.net/ubuntu/+source/runc-app/1.3.3-0ubuntu1~25.04.2 https://launchpad.net/ubuntu/+source/runc-app/1.3.3-0ubuntu1~24.04.2 https://launchpad.net/ubuntu/+source/runc-app/1.3.3-0ubuntu1~22.04.2
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