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SUSE Linux Enterprise Server 16.0 glibc Important DNS Issues 2026-21164-1

suse
Calendar Grey April 21, 2026
Dist Suse Esm H88
Critical SUSE glibc update addresses important vulnerabilities that may allow invalid DNS response parsing. Install updates!
An update that solves two vulnerabilities and has one fix can now be installed.

Summary

## This update for glibc fixes the following issues: Security fixes: * CVE-2026-4437: incorrect DNS response parsing via crafted DNS server response (bsc#1260078). * CVE-2026-4438: invalid DNS hostname returned via gethostbyaddr functions (bsc#1260082). Other fixes: * nss: Missing checks in __nss_configure_lookup, __nss_database_get (bsc#1258319). ## 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 16.0 zypper in -t patch SUSE-SLES-16.0-516=1 * SUSE Linux Enterprise Server for SAP applications 16.0 zypper in -t patch SUSE-SLES-16.0-516=1 ## Package List: * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)

Topics%20covered

Topics Covered

security advisory SuSE DoS important glibc DNS

References

* bsc#1258319

* bsc#1260078

* bsc#1260082

Cross-

* CVE-2026-4437

* CVE-2026-4438

CVSS scores:

* CVE-2026-4437 ( SUSE ): 5.7

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

* CVE-2026-4437 ( SUSE ): 4.7 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

* CVE-2026-4437 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-4438 ( SUSE ): 5.7

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

* CVE-2026-4438 ( SUSE ): 4.7 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

* CVE-2026-4438 ( NVD ): 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Products:

* SUSE Linux Enterprise Server 16.0

* SUSE Linux Enterprise Server for SAP applications 16.0

An update that solves two vulnerabilities and has one fix can now be installed.

##

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21164-1
Release Date: 2026-04-10T06:36:43Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE DoS important glibc DNS

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