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SUSE Linux Micro 6.0 Important Kernel Security Update 2026-21504-1

suse
Calendar Grey May 7, 2026
Dist Suse Esm H88
A security update for SUSE Linux Kernel fixing five important issues, requires immediate attention and patching.
An update that solves five vulnerabilities can now be installed.

Summary

## This update for the SUSE Linux Enterprise Kernel 6.4.0-38.1 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 in ets_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".

Topics%20covered

Topics Covered

security advisory security issue SuSE DoS important kernel

References

* bsc#1252048

* bsc#1258005

* bsc#1258655

* bsc#1259126

* bsc#1263689

Cross-

* 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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21504-1
Release Date: 2026-05-05T13:36:02Z
Rating: important

Topics%20covered

Topics Covered

security advisory security issue SuSE DoS important kernel

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