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Fencer Vulns
medium 5.5

CVE-2024-0443 json

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

published 2024-01-11 2 y ago modified 2026-11-05 3 d ago also EUVD-2024-16238

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.5.1.el8_9
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.40.1.el9_2
  • linux Debian 14, Debian 13 6.3.11-1

debian advisories DEBIAN-CVE-2024-0443

  • kernel RHEL 8 4.18.0-513.5.1.el8_9
  • perf RHEL 8 4.18.0-513.5.1.el8_9
  • bpftool RHEL 8 4.18.0-513.5.1.el8_9
  • kernel-core RHEL 8 4.18.0-513.5.1.el8_9
  • kernel-tools RHEL 8 4.18.0-513.5.1.el8_9
  • python3-perf RHEL 8 4.18.0-513.5.1.el8_9
  • kernel-modules RHEL 8 4.18.0-513.5.1.el8_9
  • kernel-zfcpdump RHEL 8 4.18.0-513.5.1.el8_9

red hat advisories RHSA-2023:7370RHSA-2023:7077RHSA-2023:6583

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-0443 updated cvss 5.5

kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.

  • Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    affected: workaround, no fix available “This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.5.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.5.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.5.1.el8_9
    fixed: vendor fix “This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio” RHSA-2023:7077
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.40.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.40.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.40.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.40.1.el9_2 Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.40.1.el9_2, rtla 5.14.0-284.40.1.el9_2, kernel-devel-matched 5.14.0-284.40.1.el9_2, kernel-64k-devel-matched 5.14.0-284.40.1.el9_2, kernel-debug-devel-matched 5.14.0-284.40.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.40.1.el9_2, +5 more
    fixed: vendor fix “This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio” RHSA-2023:7370
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.5.1.el8_9, kernel 4.18.0-513.5.1.el8_9, bpftool 4.18.0-513.5.1.el8_9, kernel-core 4.18.0-513.5.1.el8_9, kernel-tools 4.18.0-513.5.1.el8_9, python3-perf 4.18.0-513.5.1.el8_9, +15 more
    fixed: vendor fix “This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio” RHSA-2023:7077
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.40.1.el9_2, kernel 5.14.0-284.40.1.el9_2, kernel-64k 5.14.0-284.40.1.el9_2, kernel-core 5.14.0-284.40.1.el9_2, kernel-tools 5.14.0-284.40.1.el9_2, python3-perf 5.14.0-284.40.1.el9_2, +28 more
    fixed: vendor fix “This flaw can be mitigated with the possible workaround identified below: - systemd.unified_cgroup_hierarchy=1 or - cgroup_disable=blkio” RHSA-2023:7370
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-selftests-internal
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-402 Transmission of Private Resources into a New Sphere
  • CWE-668 Exposure of Resource to Wrong Sphere
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.