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Use After Free Affecting kernel-doc package, versions <0:4.18.0-477.75.1.el8_8

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 ID SNYK-RHEL8-KERNELDOC-8188439
  • published 15 Oct 2024
  • disclosed 21 May 2024
Report a new vulnerability Found a mistake?

Introduced: 21 May 2024

CVE-2021-47321 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade RHEL:8 kernel-doc to version 0:4.18.0-477.75.1.el8_8 or higher.
This issue was patched in RHSA-2024:8107.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc 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:

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver'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
Expand this section

Red Hat

4.4 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    High
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
Expand this section

SUSE

6.4 medium