SUSE-SU-2026:21019-1: important: Security update for glibc

[SLE-UPDATES]

# Security update for glibc

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

  * bsc#1258319
  * bsc#1260078
  * bsc#1260082

  
Cross-References:

  * 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.

## Description:

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
    * glibc-locale-2.40-160000.4.1
    * glibc-debuginfo-2.40-160000.4.1
    * glibc-2.40-160000.4.1
    * glibc-debugsource-2.40-160000.4.1
  * SUSE Linux Micro 6.2 (aarch64 x86_64)
    * glibc-gconv-modules-extra-2.40-160000.4.1
    * glibc-gconv-modules-extra-debuginfo-2.40-160000.4.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-4437.html
  * https://www.suse.com/security/cve/CVE-2026-4438.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1258319
  * https://bugzilla.suse.com/show_bug.cgi?id=1260078
  * https://bugzilla.suse.com/show_bug.cgi?id=1260082

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