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security advisoryimportantkernel-rt

SUSE Linux Micro 6.0 Key Kernel RT Version 2026-21513-1 Release

An update that solves five vulnerabilities can now be installed.. # Security update for the Linux Kernel RT (Live Patch 13 for SUSE Linux Enterprise Micro 6.0) Announcement ID: SUSE-SU-2026:21513-1 Release Date: 2026-05-05T13:07:21Z Rating: important References: * bsc#1252048 * bsc#1258005 * bsc#1258655 * bsc#1259126 * bsc#1263689 Cross-References: * CVE-2025-39977 * CVE-2025-71066 * CVE-2026-23004 * CVE-2026-23204 * CVE-2026-31431 CVSS scores: * CVE-2025-39977 ( 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-2025-39977 ( 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 ): 7.8 CVSS:3.1/AV:L/AC:L/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-2026-23204 ( 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-2026-23204 ( NVD ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H * CVE-2026-31431 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H * CVE-2026-31431 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affected Products: * SUSE Linux Micro 6.1 An update that solves five vulnerabilities can now be installed. ## Description: This update for the SUSE Linux Enterprise Kernel 6.4.0-37.1 fixes various security issues The following security issues were fixed: * CVE-2025-39977: futex: Prevent use-after-free during requeue-PI (bsc#1252048). * CVE-2025-71066: net/sched: ets: Always remove class from active list before deleting inets_qdisc_change (bsc#1258005). * CVE-2026-23004: dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list() (bsc#1258655). * CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful() (bsc#1259126). * CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place (bsc#1263689). ## 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 Micro 6.1 zypper in -t patch SUSE-SLE-Micro-6.1-kernel-381=1 ## Package List: * SUSE Linux Micro 6.1 (x86_64) * kernel-livepatch-MICRO-6-0-RT_Update_13-debugsource-5-1.1 * kernel-livepatch-6_4_0-37-rt-5-1.1 * kernel-livepatch-6_4_0-37-rt-debuginfo-5-1.1 ## References: * https://www.suse.com/security/cve/CVE-2025-39977.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-2026-23204.html * https://www.suse.com/security/cve/CVE-2026-31431.html * https://bugzilla.suse.com/show_bug.cgi?id=1252048 * https://bugzilla.suse.com/show_bug.cgi?id=1258005 * https://bugzilla.suse.com/show_bug.cgi?id=1258655 * https://bugzilla.suse.com/show_bug.cgi?id=1259126 * https://bugzilla.suse.com/show_bug.cgi?id=1263689 . Critical update for SUSE Linux Micro 6.0 fixing five important kernel RT issues for improved security.. SUSE Linux Micro,Kernels,Security Updates. . Severity: Important. LinuxSecurity.com Team

May 07, 2026 •Important SuSE