CVE-2024-0443: Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.

A flaw was found in the blkgs destruction path in block/blk-cgroup.c in the Linux kernel, leading to a cgroup blkio memory leakage problem. When a cgroup is being destroyed, cgrouprstatflush() is only called at cssreleaseworkfn(), which is called when the blkcg reference count reaches 0. This circular dependency will prevent blkcg and some blkgs from being freed after they are made offline. This issue may allow an attacker with a local access to cause system instability, such as an out of memory error.

— NVD

Linux Kernel is vulnerable to a denial of service, caused by a flaw in the blkgs destruction path in block/blk-cgroup.c. A local authenticated attacker could exploit this vulnerability to cause system instability.

— IBM