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SUSE Linux Enterprise 15 SP4 Kernel Important Security Fix 2026-1563-1

suse
Calendar Grey April 23, 2026
Dist Suse Esm H88
Updated SUSE kernel addresses critical security issues and improves system reliability through essential patches. Reboot required.
An update that solves six vulnerabilities and has one security fix can now be installed.

Summary

## The SUSE Linux Enterprise 15 SP4 kernel was updated to fix various security issues The following security issues were fixed: * CVE-2025-38234: sched/rt: Fix race in push_rt_task (bsc#1246057). * 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 issue was fixed: * watchdog/perf: properly initialize the turbo mode timestamp and rearm counter (bsc#1256504).

Topics%20covered

Topics Covered

security advisory SuSE security fix important kernel system update

References

* bsc#1246057

* bsc#1256504

* bsc#1256675

* bsc#1257773

* bsc#1259797

* bsc#1260005

* bsc#1260009

Cross-

* 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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:1563-1
Release Date: 2026-04-23T07:08:11Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE security fix important kernel system update

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