Security update for the Linux Kernel

Announcement ID:	SUSE-SU-2026:1557-1
Release Date:	2026-04-22T16:24:13Z
Rating:	important
References:	bsc#1246057 bsc#1256504 bsc#1256675 bsc#1257773 bsc#1259797 bsc#1260005 bsc#1260009
Cross-References:	CVE-2025-38234 CVE-2025-68818 CVE-2026-23103 CVE-2026-23243 CVE-2026-23272 CVE-2026-23274
CVSS scores:	CVE-2025-38234 ( SUSE ): 5.7 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2025-38234 ( SUSE ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2025-38234 ( NVD ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2025-68818 ( SUSE ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23103 ( 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-2026-23103 ( SUSE ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23103 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23103 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23243 ( SUSE ): 7.3 CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-23243 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23243 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23272 ( 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-2026-23272 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23272 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23274 ( SUSE ): 7.3 CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-23274 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23274 ( NVD ): 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 Micro 5.3 SUSE Linux Enterprise Micro 5.4 SUSE Linux Enterprise Micro for Rancher 5.3 SUSE Linux Enterprise Micro for Rancher 5.4

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

Description:

The SUSE Linux Enterprise 15 SP4 RT kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2025-38234: sched/rt: Fix race in push_rt_task (bsc#1246057).
• CVE-2025-68818: scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path" (bsc#1256675).
• CVE-2026-23103: ipvlan: Make the addrs_lock be per port (bsc#1257773).
• CVE-2026-23243: RDMA/umad: Reject negative data_len in ib_umad_write (bsc#1259797).
• CVE-2026-23272: netfilter: nf_tables: unconditionally bump set->nelems before insertion (bsc#1260009).
• CVE-2026-23274: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels (bsc#1260005).

The following non-security bugs were fixed:

• watchdog/perf: properly initialize the turbo mode timestamp and rearm counter (bsc#1256504).

Special Instructions and Notes:

• Please reboot the system after installing this update.

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 Micro for Rancher 5.3
  zypper in -t patch SUSE-SLE-Micro-5.3-2026-1557=1
• SUSE Linux Enterprise Micro 5.3
  zypper in -t patch SUSE-SLE-Micro-5.3-2026-1557=1
• SUSE Linux Enterprise Micro for Rancher 5.4
  zypper in -t patch SUSE-SLE-Micro-5.4-2026-1557=1
• SUSE Linux Enterprise Micro 5.4
  zypper in -t patch SUSE-SLE-Micro-5.4-2026-1557=1

Package List:

• SUSE Linux Enterprise Micro for Rancher 5.3 (nosrc x86_64)
  • kernel-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro for Rancher 5.3 (x86_64)
  • kernel-rt-debugsource-5.14.21-150400.15.148.1
  • kernel-rt-debuginfo-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro for Rancher 5.3 (noarch)
  • kernel-source-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.3 (nosrc x86_64)
  • kernel-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.3 (x86_64)
  • kernel-rt-debugsource-5.14.21-150400.15.148.1
  • kernel-rt-debuginfo-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.3 (noarch)
  • kernel-source-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro for Rancher 5.4 (nosrc x86_64)
  • kernel-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro for Rancher 5.4 (x86_64)
  • kernel-rt-debugsource-5.14.21-150400.15.148.1
  • kernel-rt-debuginfo-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro for Rancher 5.4 (noarch)
  • kernel-source-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.4 (nosrc x86_64)
  • kernel-rt-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.4 (x86_64)
  • kernel-rt-debugsource-5.14.21-150400.15.148.1
  • kernel-rt-debuginfo-5.14.21-150400.15.148.1
• SUSE Linux Enterprise Micro 5.4 (noarch)
  • kernel-source-rt-5.14.21-150400.15.148.1

References:

• https://www.suse.com/security/cve/CVE-2025-38234.html
• https://www.suse.com/security/cve/CVE-2025-68818.html
• https://www.suse.com/security/cve/CVE-2026-23103.html
• https://www.suse.com/security/cve/CVE-2026-23243.html
• https://www.suse.com/security/cve/CVE-2026-23272.html
• https://www.suse.com/security/cve/CVE-2026-23274.html
• https://bugzilla.suse.com/show_bug.cgi?id=1246057
• https://bugzilla.suse.com/show_bug.cgi?id=1256504
• https://bugzilla.suse.com/show_bug.cgi?id=1256675
• https://bugzilla.suse.com/show_bug.cgi?id=1257773
• https://bugzilla.suse.com/show_bug.cgi?id=1259797
• https://bugzilla.suse.com/show_bug.cgi?id=1260005
• https://bugzilla.suse.com/show_bug.cgi?id=1260009