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SUSE Linux Enterprise 12 SP5 Kernel Important Security Fix 2026-0521-1

suse
Calendar Grey February 16, 2026
Dist Suse Esm H88
This important security update for SUSE Linux Enterprise kernel addresses critical issues and ensures system reliability.
An update that solves three vulnerabilities and has one security fix can now be installed.

Summary

## This update for the SUSE Linux Enterprise kernel 4.12.14-122.269 fixes various security issues The following security issues were fixed: * CVE-2023-53321: wifi: mac80211_hwsim: drop short frames (bsc#1250314). * CVE-2025-38352: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (bsc#1249205). * 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:

Topics%20covered

Topics Covered

security advisory security issue DoS important kernel SUSE Linux Enterprise

References

* bsc#1249205

* bsc#1250280

* bsc#1250314

* bsc#1253439

Cross-

* CVE-2023-53321

* CVE-2025-38352

* CVE-2025-40186

CVSS scores:

* CVE-2023-53321 ( 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-2023-53321 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

* CVE-2023-53321 ( NVD ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

* CVE-2023-53321 ( NVD ): 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

* CVE-2025-38352 ( 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-2025-38352 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

* CVE-2025-38352 ( NVD ): 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

* CVE-2025-40186 ( SUSE ): 7.3

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:0521-1
Release Date: 2026-02-14T14:33:39Z
Rating: important

Topics%20covered

Topics Covered

security advisory security issue DoS important kernel SUSE Linux Enterprise

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