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openSUSE 15.5 Kernel Important Security Update 2026-1003-1 CVE-2025-21738

opensuse
Calendar Grey March 25, 2026
Dist Opensuse Esm H88
This update for openSUSE Leap 15.5 addresses critical issues in the Linux kernel with important security bugfixes.
An update that solves 13 vulnerabilities and has two security fixes can now be installed.

Description

The SUSE Linux Enterprise 15 SP5 kernel was updated to receive various security

bugfixes.

The following security bugs were fixed:

* CVE-2025-21738: ata: libata-sff: Ensure that we cannot write outside the

allocated buffer (bsc#1238917).

* CVE-2025-40242: gfs2: Fix unlikely race in gdlm_put_lock (bsc#1255075).

* CVE-2025-71066: net/sched: ets: Always remove class from active list before

deleting in ets_qdisc_change (bsc#1256645).

* CVE-2026-23004: dst: fix races in rt6_uncached_list_del() and

rt_del_uncached_list() (bsc#1257231).

* CVE-2026-23060: crypto: authencesn - reject too-short AAD (assoclen<8) to

match ESP/ESN spec (bsc#1257735).

* CVE-2026-23074: net/sched: Enforce that teql can only be used as root qdisc

(bsc#1257749).

* CVE-2026-23089: ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()

(bsc#1257790).

* CVE-2026-23191: ALSA: aloop: Fix racy access at PCM trigger (bsc#1258395).

* CVE-2026-23204: net/sched: cls_u32: use...

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Topics%20covered

Topics Covered

security advisory denial of service security issue important kernel OpenSUSE

Patch

## 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:

* openSUSE Leap 15.5

zypper in -t patch SUSE-2026-1003=1

* SUSE Linux Enterprise Micro 5.5

zypper in -t patch SUSE-SLE-Micro-5.5-2026-1003=1

* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5

zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-1003=1

* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5

zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-1003=1

* SUSE Linux Enterprise Server 15 SP5 LTSS

zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-1003=1

* SUSE Linux Enterprise Server for SAP Applications 15 SP5

zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-1003=1

* SUSE Linux Enterprise Live Patching 15-SP5

zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP5-2026-1003=1

Package List

* openSUSE Leap 15.5 (noarch nosrc)

* kernel-docs-5.14.21-150500.55.141.1

* openSUSE Leap 15.5 (noarch)

* kernel-source-5.14.21-150500.55.141.1

* kernel-devel-5.14.21-150500.55.141.1

* kernel-source-vanilla-5.14.21-150500.55.141.1

* kernel-macros-5.14.21-150500.55.141.1

* kernel-docs-html-5.14.21-150500.55.141.1

* openSUSE Leap 15.5 (aarch64 ppc64le x86_64)

* kernel-kvmsmall-debuginfo-5.14.21-150500.55.141.1

* kernel-kvmsmall-devel-5.14.21-150500.55.141.1

* kernel-default-base-rebuild-5.14.21-150500.55.141.1.150500.6.69.2

* kernel-kvmsmall-debugsource-5.14.21-150500.55.141.1

* kernel-kvmsmall-devel-debuginfo-5.14.21-150500.55.141.1

* kernel-default-base-5.14.21-150500.55.141.1.150500.6.69.2

* openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64)

* ocfs2-kmp-default-5.14.21-150500.55.141.1

* kernel-default-extra-debuginfo-5.14.21-150500.55.141.1

* kernel-obs-qa-5.14.21-150500.55.141.1

* reiserfs-kmp-default-5.14.21-150500.55.141.1

* dlm-kmp-default-5.14.21-150500.55.141.1

*...

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References

* bsc#1238917

* bsc#1255075

* bsc#1256645

* bsc#1257231

* bsc#1257473

* bsc#1257732

* bsc#1257735

* bsc#1257749

* bsc#1257790

* bsc#1258340

* bsc#1258395

* bsc#1258518

* bsc#1258849

* bsc#1258850

* bsc#1259857

## References:

* https://www.suse.com/security/cve/CVE-2025-21738.html

* https://www.suse.com/security/cve/CVE-2025-40242.html

* https://www.suse.com/security/cve/CVE-2025-71066.html

* https://www.suse.com/security/cve/CVE-2026-23004.html

* https://www.suse.com/security/cve/CVE-2026-23054.html

* https://www.suse.com/security/cve/CVE-2026-23060.html

* https://www.suse.com/security/cve/CVE-2026-23074.html

* https://www.suse.com/security/cve/CVE-2026-23089.html

* https://www.suse.com/security/cve/CVE-2026-23191.html

* https://www.suse.com/security/cve/CVE-2026-23204.html

* https://www.suse.com/security/cve/CVE-2026-23209.html

* https://www.suse.com/security/cve/CVE-2026-23268.html

* https://www.suse.com/security/cve/CVE-2026-23269.html

* https://bugzilla.suse.com/show_bug.cgi?id=1238917

*...

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Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:1003-1
Release Date: 2026-03-25T09:25:51Z
Affected Products: * openSUSE Leap 15.5 * SUSE Linux Enterprise High Performance Computing 15 SP5 * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 * SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 * SUSE Linux Enterprise Live Patching 15-SP5 * SUSE Linux Enterprise Micro 5.5 * SUSE Linux Enterprise Real Time 15 SP5 * SUSE Linux Enterprise Server 15 SP5 * SUSE Linux Enterprise Server 15 SP5 LTSS * SUSE Linux Enterprise Server for SAP Applications 15 SP5

Topics%20covered

Topics Covered

security advisory denial of service security issue important kernel OpenSUSE

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