Use After Free Affecting kernel-livepatch-5_14_21-150500_55_91-default package, versions <12-150500.2.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.26% (19th percentile)

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  • Snyk IDSNYK-SLES155-KERNELLIVEPATCH514211505005591DEFAULT-13543040
  • published14 Oct 2025
  • disclosed11 Oct 2025

Introduced: 11 Oct 2025

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

How to fix?

Upgrade SLES:15.5 kernel-livepatch-5_14_21-150500_55_91-default to version 12-150500.2.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-5_14_21-150500_55_91-default package and not the kernel-livepatch-5_14_21-150500_55_91-default package as distributed by SLES. See How to fix? for SLES:15.5 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