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SUSE alert SUSE-SU-2026:1077-1 (kernel)



From:
              OPENSUSE-SECURITY-UPDATES <null@suse.de>


To:
              security-announce@lists.opensuse.org


Subject:
              SUSE-SU-2026:1077-1: important: Security update for the Linux Kernel


Date:
              Thu, 26 Mar 2026 20:39:06 -0000


Message-ID:
              <177455754614.1119.5985890419664860527@c498d0a85550>


Archive-link:
              Article




# 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





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