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SUSE Linux Enterprise 12 SP5 Kernel Important TCP Security Fix 2026-0525-1

suse
Calendar Grey February 16, 2026
Dist Suse Esm H88
Critical security update for SUSE Linux kernel to fix severity issues identified in CVE-2025-40186 and enhance system protection.
An update that solves one vulnerability and has one security fix can now be installed.

Summary

## This update for the SUSE Linux Enterprise kernel 4.12.14-122.275 fixes one security issue The following security issue was fixed: * CVE-2025-40186: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request() (bsc#1253439). The following non security issue was fixed: * bsc#1250280: don't expose {file,inode}_operations with static lifetimes Fix issue with static lifetime empty_iops/no_open_fops by allocating them on the heap. Make sure previously assigned instances don't become dangling. (bsc#1250280). ## 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 Live Patching 12-SP5

Topics%20covered

Topics Covered

security advisory security issue SuSE important kernel TCP

References

* bsc#1250280

* bsc#1253439

Cross-

* CVE-2025-40186

CVSS scores:

* 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 Enterprise High Performance Computing 12 SP5

* SUSE Linux Enterprise Live Patching 12-SP5

* SUSE Linux Enterprise Server 12 SP5

* SUSE Linux Enterprise Server for SAP Applications 12 SP5

An update that solves one vulnerability and has one security fix can now be

installed.

##

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

* https://bugzilla.suse.com/show_bug.cgi?id=1250280

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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:0525-1
Release Date: 2026-02-14T17:04:03Z
Rating: important

Topics%20covered

Topics Covered

security advisory security issue SuSE important kernel TCP

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