USN-7851-2: runC 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)