CVE-2023-52638 Affecting kernel-rt-devel package, versions <0:5.14.0-427.26.1.el9_4


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-ROCKY9-KERNELRTDEVEL-7571273
  • published27 Jul 2024
  • disclosed3 Apr 2024

Introduced: 3 Apr 2024

CVE-2023-52638  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 kernel-rt-devel to version 0:5.14.0-427.26.1.el9_4 or higher.
This issue was patched in RLSA-2024:4583.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel package and not the kernel-rt-devel package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

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]

CVSS Scores

version 3.1