CVE-2023-52638 (GCVE-0-2023-52638)
Vulnerability from cvelistv5
Published
2024-04-03 14:54
Modified
2026-01-05 10:16
Severity ?
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386
Version: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386
Version: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386
Version: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386
Version: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386
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