Medium [CVE-2024-0443] blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.
This medium-severity Red Hat Linux advisory covers CVE-2024-0443 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat package: kernel-rt.
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Summary
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.
This flaw affects RHEL 8.6 and above, and RHEL9.2 and above. Released kernel streamers only.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-402.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.2 Extended Update Support; Red Hat Enterprise Linux 9. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7 as not affected.
Red Hat fixing advisory: RHSA-2023:7077, RHSA-2023:7370.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
- kernel-0:4.18.0-513.5.1.el8_9
- kernel-0:5.14.0-284.40.1.el9_2
- RHSA-2023:7077
- RHSA-2023:7370
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
Mitigation checklist
- This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
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