Use of Uninitialized Variable Affecting kernel-rt-debug-core package, versions <0:4.18.0-553.16.1.rt7.357.el8_10


Severity

Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.05% (17th percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRTDEBUGCORE-7291069
  • published 20 Jun 2024
  • disclosed 19 Jun 2024

How to fix?

Upgrade Centos:8 kernel-rt-debug-core to version 0:4.18.0-553.16.1.rt7.357.el8_10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-core package and not the kernel-rt-debug-core package as distributed by Centos. See How to fix? for Centos:8 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 Scores

version 3.1
Expand this section

Red Hat

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