SUSE-SU-2025:02602-1: important: Security update for the Linux Kernel RT (Live Patch 9 for SLE 15 SP6)

[SLE-SECURITY-UPDATES]

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

Announcement ID: SUSE-SU-2025:02602-1  
Release Date: 2025-08-02T06:06:10Z  
Rating: important  
References:

  * bsc#1245776
  * bsc#1245793
  * bsc#1245797

  
Cross-References:

  * CVE-2025-21702
  * CVE-2025-37752
  * CVE-2025-37797

  
CVSS scores:

  * CVE-2025-21702 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-37752 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-37797 ( 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 three vulnerabilities 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-2025-37797: net_sched: hfsc: Fix a UAF vulnerability in class handling
    (bsc#1245793).
  * CVE-2025-37752: net_sched: sch_sfq: move the limit validation (bsc#1245776).
  * CVE-2025-21702: pfifo_tail_enqueue: Drop new packet when sch->limit == 0
    (bsc#1245797).

## 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-SP6-2025-2602=1 SUSE-SLE-
Module-Live-Patching-15-SP6-2025-2603=1

## Package List:

  * SUSE Linux Enterprise Live Patching 15-SP6 (x86_64)
    * kernel-livepatch-6_4_0-150600_10_26-rt-4-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_29-rt-4-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_29-rt-debuginfo-4-150600.2.1
    * kernel-livepatch-SLE15-SP6-RT_Update_9-debugsource-4-150600.2.1
    * kernel-livepatch-6_4_0-150600_10_26-rt-debuginfo-4-150600.2.1
    * kernel-livepatch-SLE15-SP6-RT_Update_8-debugsource-4-150600.2.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-21702.html
  * https://www.suse.com/security/cve/CVE-2025-37752.html
  * https://www.suse.com/security/cve/CVE-2025-37797.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1245776
  * https://bugzilla.suse.com/show_bug.cgi?id=1245793
  * https://bugzilla.suse.com/show_bug.cgi?id=1245797

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