Security update for the Linux Kernel

Announcement ID:	SUSE-SU-2026:0961-1
Release Date:	2026-03-23T09:08:52Z
Rating:	important
References:	bsc#1238917 bsc#1246166 bsc#1247177 bsc#1255049 bsc#1255163 bsc#1255401 bsc#1256645 bsc#1257231 bsc#1257735 bsc#1257749 bsc#1257790 bsc#1258340 bsc#1258395 bsc#1258849
Cross-References:	CVE-2023-53794 CVE-2023-53827 CVE-2025-21738 CVE-2025-38224 CVE-2025-38375 CVE-2025-68285 CVE-2025-71066 CVE-2026-23004 CVE-2026-23060 CVE-2026-23074 CVE-2026-23089 CVE-2026-23191 CVE-2026-23204 CVE-2026-23268 CVE-2026-23269
CVSS scores:	CVE-2023-53794 ( SUSE ): 7.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2023-53794 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2023-53827 ( 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-2023-53827 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H 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-2025-38224 ( SUSE ): 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2025-38224 ( NVD ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVE-2025-38375 ( 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-2025-38375 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2025-38375 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVE-2025-68285 ( 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-2025-68285 ( 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-2026-23060 ( 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-2026-23268 ( 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:	SUSE Linux Enterprise Micro 5.2 SUSE Linux Enterprise Micro for Rancher 5.2

An update that solves 15 vulnerabilities can now be installed.

Description:

The SUSE Linux Enterprise 15 SP3 RT kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2023-53794: cifs: fix session state check in reconnect to avoid use-after-free issue (bsc#1255163).
• CVE-2023-53827: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} (bsc#1255049).
• CVE-2025-21738: ata: libata-sff: Ensure that we cannot write outside the allocated buffer (bsc#1238917).
• CVE-2025-38224: can: kvaser_pciefd: refine error prone echo_skb_max handling logic (bsc#1246166).
• CVE-2025-38375: virtio-net: ensure the received length does not exceed allocated size (bsc#1247177).
• CVE-2025-68285: libceph: fix potential use-after-free in have_mon_and_osd_map() (bsc#1255401).
• 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 skb_header_pointer_careful() (bsc#1258340).
• CVE-2026-23268: apparmor: fix unprivileged local user can do privileged policy management
• CVE-2026-23269: apparmor: validate DFA start states are in bounds in unpack_pdb

The following non-security bugs were fixed:

• Disable CONFIG_NET_SCH_ATM (jsc#PED-12836).
• apparmor: Fix double free of ns_name in aa_replace_profiles() (bsc#1258849).
• apparmor: fix differential encoding verification (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 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:

• SUSE Linux Enterprise Micro 5.2
  zypper in -t patch SUSE-SUSE-MicroOS-5.2-2026-961=1
• SUSE Linux Enterprise Micro for Rancher 5.2
  zypper in -t patch SUSE-SUSE-MicroOS-5.2-2026-961=1

Package List:

• SUSE Linux Enterprise Micro 5.2 (nosrc x86_64)
  • kernel-rt-5.3.18-150300.238.1
• SUSE Linux Enterprise Micro 5.2 (x86_64)
  • kernel-rt-debugsource-5.3.18-150300.238.1
  • kernel-rt-debuginfo-5.3.18-150300.238.1
• SUSE Linux Enterprise Micro 5.2 (noarch)
  • kernel-source-rt-5.3.18-150300.238.1
• SUSE Linux Enterprise Micro for Rancher 5.2 (nosrc x86_64)
  • kernel-rt-5.3.18-150300.238.1
• SUSE Linux Enterprise Micro for Rancher 5.2 (x86_64)
  • kernel-rt-debugsource-5.3.18-150300.238.1
  • kernel-rt-debuginfo-5.3.18-150300.238.1
• SUSE Linux Enterprise Micro for Rancher 5.2 (noarch)
  • kernel-source-rt-5.3.18-150300.238.1

References:

• https://www.suse.com/security/cve/CVE-2023-53794.html
• https://www.suse.com/security/cve/CVE-2023-53827.html
• https://www.suse.com/security/cve/CVE-2025-21738.html
• https://www.suse.com/security/cve/CVE-2025-38224.html
• https://www.suse.com/security/cve/CVE-2025-38375.html
• https://www.suse.com/security/cve/CVE-2025-68285.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-2026-23060.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-2026-23268.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=1246166
• https://bugzilla.suse.com/show_bug.cgi?id=1247177
• https://bugzilla.suse.com/show_bug.cgi?id=1255049
• https://bugzilla.suse.com/show_bug.cgi?id=1255163
• https://bugzilla.suse.com/show_bug.cgi?id=1255401
• 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=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=1258849