SUSE-RU-2026:20185-1: important: Recommended update for grub2

[SLE-UPDATES]

# Recommended update for grub2

Announcement ID: SUSE-RU-2026:20185-1  
Release Date: 2026-01-28T11:26:08Z  
Rating: important  
References:

  * bsc#1248516

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP Applications 16.0

  
  
An update that has one fix can now be installed.

## Description:

This update for grub2 fixes the following issues:

  * Optimize PBKDF2 to reduce the decryption time (bsc#1248516)
    * lib/crypto: Introduce new HMAC functions to reuse buffers
    * lib/pbkdf2: Optimize PBKDF2 by reusing HMAC handle
    * kern/misc: Implement faster grub_memcpy() for aligned buffers

## 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-16.0-206=1

  * SUSE Linux Enterprise Server for SAP Applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-206=1

## Package List:

  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * grub2-common-2.12-160000.4.1
    * grub2-common-debuginfo-2.12-160000.4.1
    * grub2-2.12-160000.4.1
  * SUSE Linux Enterprise Server 16.0 (noarch)
    * grub2-snapper-plugin-2.12-160000.4.1
    * grub2-i386-pc-2.12-160000.4.1
    * grub2-arm64-efi-2.12-160000.4.1
    * grub2-powerpc-ieee1275-2.12-160000.4.1
    * grub2-x86_64-efi-2.12-160000.4.1
    * grub2-systemd-sleep-plugin-2.12-160000.4.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 s390x x86_64)
    * grub2-debugsource-2.12-160000.4.1
  * SUSE Linux Enterprise Server 16.0 (s390x)
    * grub2-s390x-emu-2.12-160000.4.1
  * SUSE Linux Enterprise Server for SAP Applications 16.0 (ppc64le x86_64)
    * grub2-common-2.12-160000.4.1
    * grub2-common-debuginfo-2.12-160000.4.1
    * grub2-2.12-160000.4.1
  * SUSE Linux Enterprise Server for SAP Applications 16.0 (x86_64)
    * grub2-debugsource-2.12-160000.4.1
  * SUSE Linux Enterprise Server for SAP Applications 16.0 (noarch)
    * grub2-snapper-plugin-2.12-160000.4.1
    * grub2-i386-pc-2.12-160000.4.1
    * grub2-powerpc-ieee1275-2.12-160000.4.1
    * grub2-x86_64-efi-2.12-160000.4.1
    * grub2-systemd-sleep-plugin-2.12-160000.4.1

## References:

  * https://bugzilla.suse.com/show_bug.cgi?id=1248516

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