CVE-2024-0443

Published: Jan 11, 2024

Modified: Nov 7, 2025

PUBLISHED

CVSS v3.1

5.5

MEDIUM

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.

Vendor	Product	Versions
Unknown	kernel	affected `0 - < 6.4-rc7`
Red Hat	Red Hat Enterprise Linux 8	unaffected `0:4.18.0-513.5.1.el8_9 - < *`
Red Hat	Red Hat Enterprise Linux 9	unaffected `0:5.14.0-362.8.1.el9_3 - < *`
Red Hat	Red Hat Enterprise Linux 9	unaffected `0:5.14.0-362.8.1.el9_3 - < *`
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected `0:5.14.0-284.40.1.el9_2 - < *`
Red Hat	Red Hat Enterprise Linux 6	All versions
Red Hat	Red Hat Enterprise Linux 7	All versions
Red Hat	Red Hat Enterprise Linux 7	All versions
Red Hat	Red Hat Enterprise Linux 8	All versions
Red Hat	Red Hat Enterprise Linux 9	All versions