Use After Free Affecting kernel-rt-64k-modules package, versions <0:5.14.0-611.5.1.el9_7


Severity

Recommended
medium

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.23% (14th percentile)

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  • Snyk IDSNYK-ROCKY9-KERNELRT64KMODULES-14133650
  • published27 Nov 2025
  • disclosed27 Feb 2025

Introduced: 27 Feb 2025

CVE-2025-21791  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 kernel-rt-64k-modules to version 0:5.14.0-611.5.1.el9_7 or higher.
This issue was patched in RLSA-2025:20518.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-64k-modules package and not the kernel-rt-64k-modules package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

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

vrf: use RCU protection in l3mdev_l3_out()

l3mdev_l3_out() can be called without RCU being held:

raw_sendmsg() ip_push_pending_frames() ip_send_skb() ip_local_out() __ip_local_out() l3mdev_ip_out()

Add rcu_read_lock() / rcu_read_unlock() pair to avoid a potential UAF.

CVSS Base Scores

version 3.1