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SUSE Linux Enterprise 16 Kernel Important Security Patch 2026-21558-1

suse
Calendar Grey May 11, 2026
Dist Suse Esm H88
An important SUSE Linux kernel update resolves four vulnerabilities with recommended patching steps.
An update that solves four vulnerabilities can now be installed.

Summary

## This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.27.1 fixes various security issues The following security issues were fixed: * CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful() (bsc#1259126). * CVE-2026-23437: net: shaper: protect late read accesses to the hierarchy (bsc#1261845). * CVE-2026-31406: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() (bsc#1261630). * 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 Enterprise Server for SAP applications 16.0

Topics%20covered

Topics Covered

security advisory security issue DoS important kernel SuSE Linux

References

* bsc#1259126

* bsc#1261630

* bsc#1261845

* bsc#1263689

Cross-

* CVE-2026-23204

* CVE-2026-23437

* CVE-2026-31406

* CVE-2026-31431

CVSS scores:

* 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-2026-23437 ( 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-2026-23437 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

* CVE-2026-23437 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21558-1
Release Date: 2026-05-05T22:36:52Z
Rating: important

Topics%20covered

Topics Covered

security advisory security issue DoS important kernel SuSE Linux

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