Security update for the Linux Kernel RT (Live Patch 10 for SLE 15 SP6)

Announcement ID:	SUSE-SU-2025:02637-1
Release Date:	2025-08-04T11:34:13Z
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:	openSUSE Leap 15.3 openSUSE Leap 15.5 SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise High Performance Computing 15 SP3 SUSE Linux Enterprise High Performance Computing 15 SP5 SUSE Linux Enterprise Live Patching 12-SP5 SUSE Linux Enterprise Live Patching 15-SP3 SUSE Linux Enterprise Live Patching 15-SP5 SUSE Linux Enterprise Live Patching 15-SP6 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Micro 5.2 SUSE Linux Enterprise Micro 5.5 SUSE Linux Enterprise Real Time 15 SP5 SUSE Linux Enterprise Real Time 15 SP6 SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server 15 SP3 SUSE Linux Enterprise Server 15 SP5 SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server for SAP Applications 12 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP3 SUSE Linux Enterprise Server for SAP Applications 15 SP5 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_34 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 12-SP5
  zypper in -t patch SUSE-SLE-Live-Patching-12-SP5-2025-2637=1 SUSE-SLE-Live-Patching-12-SP5-2025-2622=1 SUSE-SLE-Live-Patching-12-SP5-2025-2663=1
• openSUSE Leap 15.3
  zypper in -t patch SUSE-2025-2650=1
• SUSE Linux Enterprise Live Patching 15-SP3
  zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP3-2025-2650=1
• openSUSE Leap 15.5
  zypper in -t patch SUSE-2025-2654=1 SUSE-2025-2642=1
• SUSE Linux Enterprise Live Patching 15-SP5
  zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP5-2025-2654=1 SUSE-SLE-Module-Live-Patching-15-SP5-2025-2642=1
• SUSE Linux Enterprise Live Patching 15-SP6
  zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP6-2025-2635=1

Package List:

• SUSE Linux Enterprise Live Patching 12-SP5 (ppc64le s390x x86_64)
  • kgraft-patch-4_12_14-122_244-default-7-2.1
  • kgraft-patch-4_12_14-122_247-default-5-2.1
  • kgraft-patch-4_12_14-122_255-default-4-2.1
• openSUSE Leap 15.3 (ppc64le s390x x86_64)
  • kernel-livepatch-5_3_18-150300_59_198-default-5-150300.2.1
  • kernel-livepatch-SLE15-SP3_Update_55-debugsource-5-150300.2.1
  • kernel-livepatch-5_3_18-150300_59_198-default-debuginfo-5-150300.2.1
• openSUSE Leap 15.3 (x86_64)
  • kernel-livepatch-5_3_18-150300_59_198-preempt-5-150300.2.1
  • kernel-livepatch-5_3_18-150300_59_198-preempt-debuginfo-5-150300.2.1
• SUSE Linux Enterprise Live Patching 15-SP3 (ppc64le s390x x86_64)
  • kernel-livepatch-5_3_18-150300_59_198-default-5-150300.2.1
• openSUSE Leap 15.5 (ppc64le s390x x86_64)
  • kernel-livepatch-SLE15-SP5_Update_24-debugsource-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_94-default-debuginfo-4-150500.2.1
  • kernel-livepatch-SLE15-SP5_Update_23-debugsource-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_97-default-debuginfo-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_94-default-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_97-default-4-150500.2.1
• SUSE Linux Enterprise Live Patching 15-SP5 (ppc64le s390x x86_64)
  • kernel-livepatch-SLE15-SP5_Update_24-debugsource-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_94-default-debuginfo-4-150500.2.1
  • kernel-livepatch-SLE15-SP5_Update_23-debugsource-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_97-default-debuginfo-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_94-default-4-150500.2.1
  • kernel-livepatch-5_14_21-150500_55_97-default-4-150500.2.1
• SUSE Linux Enterprise Live Patching 15-SP6 (x86_64)
  • kernel-livepatch-6_4_0-150600_10_34-rt-debuginfo-3-150600.2.1
  • kernel-livepatch-SLE15-SP6-RT_Update_10-debugsource-3-150600.2.1
  • kernel-livepatch-6_4_0-150600_10_34-rt-3-150600.2.1

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