CVE-2022-48671: cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-03 · updated 2026-06-17
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all() syzbot is hitting percpu_rwsem_assert_held(&cpu_hotplug_lock) warning at cpuset_attach() [1], for commit 4f7e7236435ca0ab ("cgroup: Fix threadgroup_rwsem <-> cpus_read_lock() deadlock") missed that cpuset_attach() is also called from cgroup_attach_task_all(). Add cpus_read_lock() like what cgroup_procs_write_start() does.

Affected products

Linux kernel: from 5.4.213 before 5.4.215; from 5.10.143 before 5.10.145; from 5.15.68 (excl.) before 5.15.70; from 5.19.9 before 5.19.11 — fixed in 5.10.145, 5.15.70, 5.19.11, 5.4.215

How to fix

Upgrade to a fixed version: Linux kernel 5.10.145, 5.15.70, 5.19.11, 5.4.215. Check the vendor advisory for mitigations.

References

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