Deadlock The advisory has been revoked - it doesn't affect any version of package kernel (opens in a new tab)
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL9-KERNEL-9482391
- published19 Mar 2025
- disclosed3 Apr 2024
Introduced: 3 Apr 2024
CVE-2023-52638 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:9.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock
The following 3 locks would race against each other, causing the deadlock situation in the Syzbot bug report:
- j1939_socks_lock
- active_session_list_lock
- sk_session_queue_lock
A reasonable fix is to change j1939_socks_lock to an rwlock, since in the rare situations where a write lock is required for the linked list that j1939_socks_lock is protecting, the code does not attempt to acquire any more locks. This would break the circular lock dependency, where, for example, the current thread already locks j1939_socks_lock and attempts to acquire sk_session_queue_lock, and at the same time, another thread attempts to acquire j1939_socks_lock while holding sk_session_queue_lock.
NOTE: This patch along does not fix the unregister_netdevice bug reported by Syzbot; instead, it solves a deadlock situation to prepare for one or more further patches to actually fix the Syzbot bug, which appears to be a reference counting problem within the j1939 codebase.
[mkl: remove unrelated newline change]
References
- https://access.redhat.com/security/cve/CVE-2023-52638
- https://git.kernel.org/stable/c/03358aba991668d3bb2c65b3c82aa32c36851170
- https://git.kernel.org/stable/c/26dfe112ec2e95fe0099681f6aec33da13c2dd8e
- https://git.kernel.org/stable/c/559b6322f9480bff68cfa98d108991e945a4f284
- https://git.kernel.org/stable/c/6cdedc18ba7b9dacc36466e27e3267d201948c8d
- https://git.kernel.org/stable/c/aedda066d717a0b4335d7e0a00b2e3a61e40afcf