CVE-2024-53211 Affecting kernel-uek-modules-extra-netfilter package, versions <0:6.12.0-101.33.4.3.el9uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-ORACLE9-KERNELUEKMODULESEXTRANETFILTER-10790058
  • published19 Jul 2025
  • disclosed27 Dec 2024

Introduced: 27 Dec 2024

CVE-2024-53211  (opens in a new tab)

How to fix?

Upgrade Oracle:9 kernel-uek-modules-extra-netfilter to version 0:6.12.0-101.33.4.3.el9uek or higher.
This issue was patched in ELSA-2025-20480.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-modules-extra-netfilter package and not the kernel-uek-modules-extra-netfilter package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

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

net/l2tp: fix warning in l2tp_exit_net found by syzbot

In l2tp's net exit handler, we check that an IDR is empty before destroying it:

WARN_ON_ONCE(!idr_is_empty(&amp;pn-&gt;l2tp_tunnel_idr));
idr_destroy(&amp;pn-&gt;l2tp_tunnel_idr);

By forcing memory allocation failures in idr_alloc_32, syzbot is able to provoke a condition where idr_is_empty returns false despite there being no items in the IDR. This turns out to be because the radix tree of the IDR contains only internal radix-tree nodes and it is this that causes idr_is_empty to return false. The internal nodes are cleaned by idr_destroy.

Use idr_for_each to check that the IDR is empty instead of idr_is_empty to avoid the problem.

CVSS Base Scores

version 3.1