SUSE-SU-2025:03100-1: important: Security update for the Linux Kernel RT (Live Patch 9 for SLE 15 SP6)

Tue Sep 9 08:30:35 UTC 2025

# Security update for the Linux Kernel RT (Live Patch 9 for SLE 15 SP6)

Announcement ID: SUSE-SU-2025:03100-1  
Release Date: 2025-09-08T21:13:08Z  
Rating: important  
References:

  * bsc#1236207
  * bsc#1242579
  * bsc#1244235
  * bsc#1245505
  * bsc#1245775
  * bsc#1245791
  * bsc#1245805
  * bsc#1246030
  * bsc#1248108

Cross-References:

  * CVE-2025-21659
  * CVE-2025-21701
  * CVE-2025-21999
  * CVE-2025-37890
  * CVE-2025-38000
  * CVE-2025-38001
  * CVE-2025-38087
  * CVE-2025-38212

CVSS scores:

  * CVE-2025-21659 ( SUSE ):  8.4
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2025-21659 ( SUSE ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
  * CVE-2025-21701 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-21999 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-21999 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-21999 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-37890 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38000 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-38000 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38001 ( SUSE ):  8.5
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-38001 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38087 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-38087 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38212 ( SUSE ):  8.5
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-38212 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products:

  * SUSE Linux Enterprise Live Patching 15-SP6
  * SUSE Linux Enterprise Real Time 15 SP6
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6

An update that solves eight vulnerabilities and has one security fix can now be
installed.

## Description:

This update for the Linux Kernel 6.4.0-150600_10_29 fixes several issues.

The following security issues were fixed:

  * CVE-2025-38087: net/sched: fix use-after-free in taprio_dev_notifier
    (bsc#1245504).
  * CVE-2025-21999: proc: fix UAF in proc_get_inode() (bsc#1242579).
  * CVE-2025-38001: net_sched: hfsc: Address reentrant enqueue adding class to
    eltree twice (bsc#1244235).
  * CVE-2025-21659: netdev: prevent accessing NAPI instances from another
    namespace (bsc#1236207).
  * CVE-2025-38000: sch_hfsc: Fix qlen accounting bug when using peek in
    hfsc_enqueue() (bsc#1245775).
  * CVE-2025-37890: net_sched: hfsc: Fix a UAF vulnerability in class with netem
    as child qdisc (bsc#1245791).
  * CVE-2025-21701: net: avoid race between device unregistration and ethnl ops
    (bsc#1245805).
  * CVE-2025-38212: ipc: fix to protect IPCS lookups using RCU (bsc#1246030).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Live Patching 15-SP6  
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP6-2025-3100=1 SUSE-SLE-
Module-Live-Patching-15-SP6-2025-3102=1 SUSE-SLE-Module-Live-
Patching-15-SP6-2025-3103=1

## Package List:

  * SUSE Linux Enterprise Live Patching 15-SP6 (x86_64)
    * kernel-livepatch-6_4_0-150600_10_20-rt-11-150600.2.1
    * kernel-livepatch-SLE15-SP6-RT_Update_6-debugsource-11-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_29-rt-6-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_29-rt-debuginfo-6-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_26-rt-6-150600.2.1
    * kernel-livepatch-SLE15-SP6-RT_Update_8-debugsource-6-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_26-rt-debuginfo-6-150600.2.1
    * kernel-livepatch-SLE15-SP6-RT_Update_9-debugsource-6-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_20-rt-debuginfo-11-150600.2.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-21659.html
  * https://www.suse.com/security/cve/CVE-2025-21701.html
  * https://www.suse.com/security/cve/CVE-2025-21999.html
  * https://www.suse.com/security/cve/CVE-2025-37890.html
  * https://www.suse.com/security/cve/CVE-2025-38000.html
  * https://www.suse.com/security/cve/CVE-2025-38001.html
  * https://www.suse.com/security/cve/CVE-2025-38087.html
  * https://www.suse.com/security/cve/CVE-2025-38212.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1236207
  * https://bugzilla.suse.com/show_bug.cgi?id=1242579
  * https://bugzilla.suse.com/show_bug.cgi?id=1244235
  * https://bugzilla.suse.com/show_bug.cgi?id=1245505
  * https://bugzilla.suse.com/show_bug.cgi?id=1245775
  * https://bugzilla.suse.com/show_bug.cgi?id=1245791
  * https://bugzilla.suse.com/show_bug.cgi?id=1245805
  * https://bugzilla.suse.com/show_bug.cgi?id=1246030
  * https://bugzilla.suse.com/show_bug.cgi?id=1248108

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