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SUSE Linux Micro Kernel RT Important Security Issues 2026-21082-1

suse
Calendar Grey April 13, 2026
Dist Suse Esm H88
Critical update for SUSE Linux Kernel RT addressing important security issues. Install patches for enhanced protection.
An update that solves six 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-2025-40159: xsk: Harden userspace-supplied xdp_desc validation (bsc#1253404). * CVE-2025-71120: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf (bsc#1256780). * CVE-2026-22999: net/sched: sch_qfq: do not free existing class in qfq_change_class() (bsc#1257238). * CVE-2026-23074: net/sched: Enforce that teql can only be used as root qdisc (bsc#1258051). * CVE-2026-23111: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() (bsc#1258183). * CVE-2026-23209: macvlan: fix error recovery in macvlan_common_newlink() (bsc#1258784). ## Patch Instructions:

Topics%20covered

Topics Covered

security advisory security issue SuSE remote access important kernel-rt

References

* bsc#1253404

* bsc#1256780

* bsc#1257238

* bsc#1258051

* bsc#1258183

* bsc#1258784

Cross-

* CVE-2025-40159

* CVE-2025-71120

* CVE-2026-22999

* CVE-2026-23074

* CVE-2026-23111

* CVE-2026-23209

CVSS scores:

* CVE-2025-40159 ( 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-2025-40159 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

* CVE-2025-71120 ( 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-2025-71120 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2025-71120 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-22999 ( 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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21082-1
Release Date: 2026-04-09T13:20:43Z
Rating: important

Topics%20covered

Topics Covered

security advisory security issue SuSE remote access important kernel-rt

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