Security update for the Linux Kernel

Announcement ID:	SUSE-SU-2026:1077-1
Release Date:	2026-03-26T12:42:31Z
Rating:	important
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 jsc#PED-12836
Cross-References:	CVE-2025-21738 CVE-2025-40242 CVE-2025-71066 CVE-2026-23004 CVE-2026-23054 CVE-2026-23060 CVE-2026-23074 CVE-2026-23089 CVE-2026-23191 CVE-2026-23204 CVE-2026-23209 CVE-2026-23268 CVE-2026-23269
CVSS scores:	CVE-2025-21738 ( 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-2025-21738 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2025-21738 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2025-40242 ( 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-2025-40242 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2025-71066 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23004 ( 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-2026-23004 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23004 ( NVD ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23054 ( 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-2026-23054 ( SUSE ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23060 ( SUSE ): 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-23060 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23060 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVE-2026-23074 ( 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-2026-23074 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23074 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23089 ( SUSE ): 5.2 CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-23089 ( SUSE ): 5.9 CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVE-2026-23089 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23191 ( SUSE ): 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-23191 ( SUSE ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVE-2026-23191 ( NVD ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23204 ( SUSE ): 6.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVE-2026-23204 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23204 ( NVD ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVE-2026-23209 ( SUSE ): 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-23209 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23209 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23268 ( 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-2026-23268 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2026-23269 ( SUSE ): 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-23269 ( SUSE ): 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Affected Products:	openSUSE Leap 15.5 SUSE Linux Enterprise Micro 5.5

An update that solves 13 vulnerabilities, contains one feature and has two security fixes can now be installed.

Description:

The SUSE Linux Enterprise 15 SP5 RT kernel was updated to fix various security issues

The following security issues 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: add skb_header_pointer_careful() helper (bsc#1258340).
• CVE-2026-23209: macvlan: fix error recovery in macvlan_common_newlink() (bsc#1258518).
• CVE-2026-23268: apparmor: fix unprivileged local user can do privileged policy management (bsc#1258850).
• CVE-2026-23269: apparmor: validate DFA start states are in bounds in unpack_pdb (bsc#1259857).

The following non security issues were fixed:

• apparmor: fix differential encoding verification (bsc#1258849).
• apparmor: Fix double free of ns_name in aa_replace_profiles() (bsc#1258849).
• apparmor: fix memory leak in verify_header (bsc#1258849).
• apparmor: fix missing bounds check on DEFAULT table in verify_dfa() (bsc#1258849).
• apparmor: fix race between freeing data and fs accessing it (bsc#1258849).
• apparmor: fix race on rawdata dereference (bsc#1258849).
• apparmor: fix side-effect bug in match_char() macro usage (bsc#1258849).
• apparmor: fix unprivileged local user can do privileged policy management (bsc#1258849).
• apparmor: fix: limit the number of levels of policy namespaces (bsc#1258849).
• apparmor: replace recursive profile removal with iterative approach (bsc#1258849).
• apparmor: validate DFA start states are in bounds in unpack_pdb (bsc#1258849).

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:

• openSUSE Leap 15.5
  zypper in -t patch SUSE-2026-1077=1
• SUSE Linux Enterprise Micro 5.5
  zypper in -t patch SUSE-SLE-Micro-5.5-2026-1077=1

Package List:

• openSUSE Leap 15.5 (noarch)
  • kernel-source-rt-5.14.21-150500.13.124.1
  • kernel-devel-rt-5.14.21-150500.13.124.1
• openSUSE Leap 15.5 (x86_64)
  • kernel-rt-extra-5.14.21-150500.13.124.1
  • kernel-syms-rt-5.14.21-150500.13.124.1
  • kernel-rt-livepatch-5.14.21-150500.13.124.1
  • kernel-rt-optional-5.14.21-150500.13.124.1
  • kernel-rt_debug-devel-5.14.21-150500.13.124.1
  • kernel-rt-debugsource-5.14.21-150500.13.124.1
  • dlm-kmp-rt-5.14.21-150500.13.124.1
  • kernel-rt-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt-optional-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt_debug-devel-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt-livepatch-devel-5.14.21-150500.13.124.1
  • kernel-rt_debug-vdso-5.14.21-150500.13.124.1
  • gfs2-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt-devel-5.14.21-150500.13.124.1
  • gfs2-kmp-rt-5.14.21-150500.13.124.1
  • kernel-rt_debug-debugsource-5.14.21-150500.13.124.1
  • kernel-rt-vdso-debuginfo-5.14.21-150500.13.124.1
  • kselftests-kmp-rt-5.14.21-150500.13.124.1
  • kernel-rt-vdso-5.14.21-150500.13.124.1
  • dlm-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt_debug-vdso-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt_debug-debuginfo-5.14.21-150500.13.124.1
  • kernel-rt-devel-debuginfo-5.14.21-150500.13.124.1
  • ocfs2-kmp-rt-5.14.21-150500.13.124.1
  • reiserfs-kmp-rt-5.14.21-150500.13.124.1
  • cluster-md-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • kselftests-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • reiserfs-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • ocfs2-kmp-rt-debuginfo-5.14.21-150500.13.124.1
  • cluster-md-kmp-rt-5.14.21-150500.13.124.1
  • kernel-rt-extra-debuginfo-5.14.21-150500.13.124.1
• openSUSE Leap 15.5 (nosrc x86_64)
  • kernel-rt_debug-5.14.21-150500.13.124.1
  • kernel-rt-5.14.21-150500.13.124.1
• SUSE Linux Enterprise Micro 5.5 (noarch)
  • kernel-source-rt-5.14.21-150500.13.124.1
  • kernel-devel-rt-5.14.21-150500.13.124.1
• SUSE Linux Enterprise Micro 5.5 (nosrc x86_64)
  • kernel-rt-5.14.21-150500.13.124.1
• SUSE Linux Enterprise Micro 5.5 (x86_64)
  • kernel-rt-debugsource-5.14.21-150500.13.124.1
  • kernel-rt-debuginfo-5.14.21-150500.13.124.1

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
• https://bugzilla.suse.com/show_bug.cgi?id=1255075
• https://bugzilla.suse.com/show_bug.cgi?id=1256645
• https://bugzilla.suse.com/show_bug.cgi?id=1257231
• https://bugzilla.suse.com/show_bug.cgi?id=1257473
• https://bugzilla.suse.com/show_bug.cgi?id=1257732
• https://bugzilla.suse.com/show_bug.cgi?id=1257735
• https://bugzilla.suse.com/show_bug.cgi?id=1257749
• https://bugzilla.suse.com/show_bug.cgi?id=1257790
• https://bugzilla.suse.com/show_bug.cgi?id=1258340
• https://bugzilla.suse.com/show_bug.cgi?id=1258395
• https://bugzilla.suse.com/show_bug.cgi?id=1258518
• https://bugzilla.suse.com/show_bug.cgi?id=1258849
• https://bugzilla.suse.com/show_bug.cgi?id=1258850
• https://bugzilla.suse.com/show_bug.cgi?id=1259857
• https://jira.suse.com/browse/PED-12836