Packages
- runc-app - Open Container Project
- runc-stable - Open Container Project
Details
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...
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)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 25.10 questing | runc – 1.3.3-0ubuntu1~25.10.3 | ||
| runc-stable – 1.3.3-0ubuntu1~25.10.3 | |||
| 25.04 plucky | runc – 1.3.3-0ubuntu1~25.04.3 | ||
| 24.04 LTS noble | runc – 1.3.3-0ubuntu1~24.04.3 | ||
| 22.04 LTS jammy | runc – 1.3.3-0ubuntu1~22.04.3 | ||
Reduce your security exposure
Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.