Race Condition Affecting kernel-64k-debug-core package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL9-KERNEL64KDEBUGCORE-7662011
  • published9 Aug 2024
  • disclosed7 Aug 2024

Introduced: 7 Aug 2024

CVE-2024-42232  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 kernel-64k-debug-core.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-debug-core package and not the kernel-64k-debug-core package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

libceph: fix race between delayed_work() and ceph_monc_stop()

The way the delayed work is handled in ceph_monc_stop() is prone to races with mon_fault() and possibly also finish_hunting(). Both of these can requeue the delayed work which wouldn't be canceled by any of the following code in case that happens after cancel_delayed_work_sync() runs -- __close_session() doesn't mess with the delayed work in order to avoid interfering with the hunting interval logic. This part was missed in commit b5d91704f53e ("libceph: behave in mon_fault() if cur_mon < 0") and use-after-free can still ensue on monc and objects that hang off of it, with monc->auth and monc->monmap being particularly susceptible to quickly being reused.

To fix this:

  • clear monc->cur_mon and monc->hunting as part of closing the session in ceph_monc_stop()
  • bail from delayed_work() if monc->cur_mon is cleared, similar to how it's done in mon_fault() and finish_hunting() (based on monc->hunting)
  • call cancel_delayed_work_sync() after the session is closed

CVSS Scores

version 3.1