SUSE-SU-2025:02977-1: important: Security update for kubernetes1.18

[SLE-SECURITY-UPDATES]

# Security update for kubernetes1.18

Announcement ID: SUSE-SU-2025:02977-1  
Release Date: 2025-08-25T12:18:40Z  
Rating: important  
References:

  * bsc#1182185
  * bsc#1246989

  
Cross-References:

  * CVE-2021-3121

  
CVSS scores:

  * CVE-2021-3121 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2021-3121 ( NVD ):  8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

  
Affected Products:

  * openSUSE Leap 15.6
  * SUSE Enterprise Storage 7.1
  * SUSE Linux Enterprise High Performance Computing 15 SP3
  * SUSE Linux Enterprise High Performance Computing 15 SP4
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP3
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
  * SUSE Linux Enterprise Server 15 SP3
  * SUSE Linux Enterprise Server 15 SP3 LTSS
  * SUSE Linux Enterprise Server 15 SP4
  * SUSE Linux Enterprise Server 15 SP4 LTSS
  * SUSE Linux Enterprise Server for SAP Applications 15 SP3
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4

  
  
An update that solves one vulnerability and has one security fix can now be
installed.

## Description:

This update for kubernetes1.18 fixes the following issues:

  * Update to version 1.18.20:
  * CVE-2021-3121: Fixed a lack of certain index validation in
    plugin/unmarshal/unmarshal.go. (bsc#1182185)

## 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 15 SP4 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2025-2977=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP3  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP3-2025-2977=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP4  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2025-2977=1

  * SUSE Enterprise Storage 7.1  
    zypper in -t patch SUSE-Storage-7.1-2025-2977=1

  * openSUSE Leap 15.6  
    zypper in -t patch openSUSE-SLE-15.6-2025-2977=1

  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP3  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP3-LTSS-2025-2977=1

  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2025-2977=1

  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2025-2977=1

  * SUSE Linux Enterprise Server 15 SP3 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP3-LTSS-2025-2977=1

## Package List:

  * SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP3 (ppc64le x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Enterprise Storage 7.1 (aarch64 x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP3 (aarch64
    x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64
    x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64
    x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1
  * SUSE Linux Enterprise Server 15 SP3 LTSS (aarch64 ppc64le s390x x86_64)
    * kubernetes1.18-client-1.18.20-150200.5.25.1
    * kubernetes1.18-client-common-1.18.20-150200.5.25.1

## References:

  * https://www.suse.com/security/cve/CVE-2021-3121.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1182185
  * https://bugzilla.suse.com/show_bug.cgi?id=1246989

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