Use After Free Affecting kernel-debug package, versions <0:4.18.0-372.119.1.el8_6


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELDEBUG-7755058
  • published21 Aug 2024
  • disclosed21 May 2024

Introduced: 21 May 2024

CVE-2021-47356  (opens in a new tab)
CWE-416  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade RHEL:8 kernel-debug to version 0:4.18.0-372.119.1.el8_6 or higher.
This issue was patched in RHSA-2024:5692.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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

mISDN: fix possible use-after-free in HFC_cleanup()

This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

CVSS Scores

version 3.1