Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.
At a glance
Severity
MEDIUM 5.5
EPSS
EPSS 0.25 % · percentile 16 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
redhat
NVD status
Modified
Description
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, cgroup_rstat_flush() is only called at css_release_work_fn(), 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.
