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SUSE glibc Important Security Update 21019-1 Addresses DNS Issues

suse
Calendar Grey April 13, 2026
Dist Suse Esm H88
Critical update for SUSE glibc fixes DNS response parsing issues addressed with important ratings.
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 Micro 6.2 zypper in -t patch SUSE-SL-Micro-6.2-516=1 ## Package List: * SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64) * glibc-locale-base-2.40-160000.4.1 * glibc-devel-debuginfo-2.40-160000.4.1 * glibc-devel-2.40-160000.4.1

Topics%20covered

Topics Covered

security advisory SuSE important glibc DNS system issue

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 Micro 6.2

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

##

* https://www.suse.com/security/cve/CVE-2026-4437.html

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21019-1
Release Date: 2026-04-10T06:18:59Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE important glibc DNS system issue

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