Google: sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6: security update to 18613.0.3

medium Tenable Self-Hosted Container Security Plugin ID 465795

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: Prevent UAF in
proc_cpuset_show() An UAF can happen when /proc/cpuset is read as reported in [1]. This can be reproduced
by the following methods: 1.add an mdelay(1000) before acquiring the cgroup_lock In the cgroup_path_ns
function. 2.$cat /proc/<pid>/cpuset repeatly. 3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/
$umount /sys/fs/cgroup/cpuset/ repeatly. The race that cause this bug can be shown as below: (umount) |
(cat /proc/<pid>/cpuset) css_release | proc_cpuset_show css_release_work_fn | css = task_get_css(tsk,
cpuset_cgrp_id); css_free_rwork_fn | cgroup_path_ns(css->cgroup, ...); cgroup_destroy_root |
mutex_lock(&cgroup_mutex); rebind_subsystems | cgroup_free_root | | // cgrp was freed, UAF |
cgroup_path_ns_locked(cgrp,..); When the cpuset is initialized, the root node top_cpuset.css.cgrp will
point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will allocate cgroup_root, and
top_cpuset.css.cgrp will point to the allocated &cgroup_root.cgrp. When the umount operation is executed,
top_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp. The problem is that when rebinding to
cgrp_dfl_root, there are cases where the cgroup_root allocated by setting up the root for cgroup v1 is
cached. This could lead to a Use-After-Free (UAF) if it is subsequently freed. The descendant cgroups of
cgroup v1 can only be freed after the css is released. However, the css of the root will never be
released, yet the cgroup_root should be freed when it is unmounted. This means that obtaining a reference
to the css of the root does not guarantee that css.cgrp->root will not be freed. Fix this problem by using
rcu_read_lock in proc_cpuset_show(). As cgroup_root is kfree_rcu after commit d23b5c577715 ("cgroup: Make
operations on the cgroup root_list RCU safe"), css->cgroup won't be freed during the critical section. To
call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to replace task_get_css with task_css.
[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd (CVE-2024-43853)

Solution

Update the sys-kernel/lakitu-kernel-6_1 library and its related packages to version 18613.0.3 or later.

Plugin Details

Severity: Medium

ID: 465795

Version: Revision 1.2

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

Vendor

Vendor Severity: MEDIUM

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2024-43853

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/17/2024

Reference Information

CVE: CVE-2024-43853

Detections

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