Use of Uninitialized Variable Affecting kernel-64k-modules-core package, versions <0:5.14.0-427.13.1.el9_4


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (19th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL9-KERNEL64KMODULESCORE-9504595
  • published21 Mar 2025
  • disclosed19 Jun 2024

Introduced: 19 Jun 2024

CVE-2021-47579  (opens in a new tab)
CWE-457  (opens in a new tab)

How to fix?

Upgrade RHEL:9 kernel-64k-modules-core to version 0:5.14.0-427.13.1.el9_4 or higher.
This issue was patched in RHSA-2024:2394.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-core package and not the kernel-64k-modules-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:

ovl: fix warning in ovl_create_real()

Syzbot triggered the following warning in ovl_workdir_create() -> ovl_create_real():

if (!err &amp;&amp; WARN_ON(!newdentry-&gt;d_inode)) {

The reason is that the cgroup2 filesystem returns from mkdir without instantiating the new dentry.

Weird filesystems such as this will be rejected by overlayfs at a later stage during setup, but to prevent such a warning, call ovl_mkdir_real() directly from ovl_workdir_create() and reject this case early.

CVSS Base Scores

version 3.1