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SUSE Linux Micro 6.0 Kernel RT Important TCP Security Issue 20518-1

suse
Calendar Grey February 27, 2026
Dist Suse Esm H88
Discover critical updates for SUSE Linux Enterprise Micro 6.0 addressing two important vulnerabilities in its kernel.
An update that solves two vulnerabilities can now be installed.

Summary

## This update for the SUSE Linux Enterprise kernel 6.4.0-36.1 fixes various security issues The following security issues were fixed: * CVE-2025-40129: sunrpc: fix null pointer dereference on zero-length checksum (bsc#1253473). * CVE-2025-40186: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request() (bsc#1253439). ## 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-269=1 ## Package List: * SUSE Linux Micro 6.1 (x86_64) * kernel-livepatch-6_4_0-36-rt-debuginfo-5-1.1 * kernel-livepatch-MICRO-6-0-RT_Update_12-debugsource-5-1.1 * kernel-livepatch-6_4_0-36-rt-5-1.1

Topics%20covered

Topics Covered

security advisory SuSE important kernel tcp issue

References

* bsc#1253439

* bsc#1253473

Cross-

* CVE-2025-40129

* CVE-2025-40186

CVSS scores:

* CVE-2025-40129 ( SUSE ): 8.7

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

* CVE-2025-40129 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2025-40186 ( 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-2025-40186 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products:

* SUSE Linux Micro 6.1

An update that solves two vulnerabilities can now be installed.

##

* https://www.suse.com/security/cve/CVE-2025-40129.html

* https://www.suse.com/security/cve/CVE-2025-40186.html

* https://bugzilla.suse.com/show_bug.cgi?id=1253439

* https://bugzilla.suse.com/show_bug.cgi?id=1253473

Severity
important
Lowest
Low
Medium
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Critical

Announcement ID: SUSE-SU-2026:20518-1
Release Date: 2026-02-19T09:19:41Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE important kernel tcp issue

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