CVE-2023-52638 (GCVE-0-2023-52638)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2026-01-05 10:16
VLAI?
Title
can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock
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]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 03358aba991668d3bb2c65b3c82aa32c36851170 (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < aedda066d717a0b4335d7e0a00b2e3a61e40afcf (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 26dfe112ec2e95fe0099681f6aec33da13c2dd8e (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 559b6322f9480bff68cfa98d108991e945a4f284 (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 6cdedc18ba7b9dacc36466e27e3267d201948c8d (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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