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New Linux Kernel cgroups Vulnerability Could Let Attackers Escape Container
Details have emerged about a now-patched high-severity vulnerability in the Linux kernel that could potentially be abused to escape a container in order to execute arbitrary commands on the container host.
The shortcoming resides in a Linux kernel feature called control groups, also referred to as cgroups version 1 (v1), which allows processes to be organized into hierarchical groups, thereby making it possible to limit and monitor the usage of resources such as CPU, memory, disk I/O, and network.
Tracked as CVE-2022-0492 (CVSS score: 7.0), the issue concerns a case of privilege escalation in the cgroups v1 release_agent functionality, a script that's executed following the termination of any process in the cgroup.