USN-7851-2
runc-app, runc-stable regression
USN-7851-1 fixed vulnerabilities in runC. The introduction of a new upstream release has caused regressions in runc-app and runc-stable. This update fixes the problem.
Original advisory 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)
What each source reports
OSV No score
runc-app, runc-stable regression
USN-7851-1 fixed vulnerabilities in runC. The introduction of a new upstream release has caused regressions in runc-app and runc-stable. This update fixes the problem.
Original advisory 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)
- Record
USN-7851-2- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
runc-appUbuntu:22.04:LTS |
before 1.3.3-0ubuntu1~22.04.3, plus listed versions 1.1.12-0ubuntu2~22.04.11.2.5-0ubuntu1~22.04.11.3.0-0ubuntu2~22.04.11.3.3-0ubuntu1~22.04.2 |
1.3.3-0ubuntu1~22.04.3 |
runc-appUbuntu:24.04:LTS |
before 1.3.3-0ubuntu1~24.04.3, plus listed versions 1.1.10-0ubuntu11.1.12-0ubuntu11.1.12-0ubuntu21.1.12-0ubuntu31.1.12-0ubuntu3.11.2.5-0ubuntu1~24.04.11.3.0-0ubuntu2~24.04.11.3.3-0ubuntu1~24.04.2 |
1.3.3-0ubuntu1~24.04.3 |
runc-appUbuntu:25.10 |
before 1.3.3-0ubuntu1~25.10.3, plus listed versions 1.2.5-0ubuntu11.3.0-0ubuntu11.3.0-0ubuntu21.3.3-0ubuntu1~25.10.2 |
1.3.3-0ubuntu1~25.10.3 |
runc-stableUbuntu:25.10 |
before 1.3.3-0ubuntu1~25.10.3, plus listed versions 1.3.0-0ubuntu11.3.3-0ubuntu1~25.10.2 |
1.3.3-0ubuntu1~25.10.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
USN-7851-2 is a vulnerability with no CVSS score yet in runc-app, published November 24, 2025. No source lists public exploit code. Fixed in runc-app 1.3.3-0ubuntu1~22.04.3.