SUSE-SU-2025:02705-1: moderate: Security update for grub2

[SLE-SECURITY-UPDATES]

# Security update for grub2

Announcement ID: SUSE-SU-2025:02705-1  
Release Date: 2025-08-05T10:08:15Z  
Rating: moderate  
References:

  * bsc#1234959

  
Cross-References:

  * CVE-2024-56738

  
CVSS scores:

  * CVE-2024-56738 ( SUSE ):  5.7
    CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2024-56738 ( SUSE ):  4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
  * CVE-2024-56738 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

  
Affected Products:

  * openSUSE Leap 15.3
  * SUSE Linux Enterprise Micro 5.2
  * SUSE Linux Enterprise Micro for Rancher 5.2

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for grub2 fixes the following issues:

  * CVE-2024-56738: Fixed side-channel attack due to not constant-time algorithm
    in grub_crypto_memcmp (bsc#1234959)

## 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:

  * openSUSE Leap 15.3  
    zypper in -t patch SUSE-2025-2705=1

  * SUSE Linux Enterprise Micro 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2025-2705=1

  * SUSE Linux Enterprise Micro for Rancher 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2025-2705=1

## Package List:

  * openSUSE Leap 15.3 (aarch64 ppc64le s390x x86_64 i586)
    * grub2-2.04-150300.22.58.1
    * grub2-debuginfo-2.04-150300.22.58.1
    * grub2-branding-upstream-2.04-150300.22.58.1
  * openSUSE Leap 15.3 (aarch64 s390x x86_64 i586)
    * grub2-debugsource-2.04-150300.22.58.1
  * openSUSE Leap 15.3 (noarch)
    * grub2-i386-pc-2.04-150300.22.58.1
    * grub2-snapper-plugin-2.04-150300.22.58.1
    * grub2-powerpc-ieee1275-debug-2.04-150300.22.58.1
    * grub2-i386-pc-debug-2.04-150300.22.58.1
    * grub2-arm64-efi-extras-2.04-150300.22.58.1
    * grub2-x86_64-xen-extras-2.04-150300.22.58.1
    * grub2-i386-xen-2.04-150300.22.58.1
    * grub2-i386-efi-debug-2.04-150300.22.58.1
    * grub2-s390x-emu-extras-2.04-150300.22.58.1
    * grub2-i386-efi-2.04-150300.22.58.1
    * grub2-x86_64-xen-2.04-150300.22.58.1
    * grub2-powerpc-ieee1275-extras-2.04-150300.22.58.1
    * grub2-x86_64-efi-2.04-150300.22.58.1
    * grub2-i386-efi-extras-2.04-150300.22.58.1
    * grub2-arm64-efi-2.04-150300.22.58.1
    * grub2-systemd-sleep-plugin-2.04-150300.22.58.1
    * grub2-arm64-efi-debug-2.04-150300.22.58.1
    * grub2-i386-pc-extras-2.04-150300.22.58.1
    * grub2-powerpc-ieee1275-2.04-150300.22.58.1
    * grub2-i386-xen-extras-2.04-150300.22.58.1
    * grub2-x86_64-efi-extras-2.04-150300.22.58.1
    * grub2-x86_64-efi-debug-2.04-150300.22.58.1
  * openSUSE Leap 15.3 (s390x)
    * grub2-s390x-emu-debug-2.04-150300.22.58.1
    * grub2-s390x-emu-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro 5.2 (aarch64 s390x x86_64)
    * grub2-debugsource-2.04-150300.22.58.1
    * grub2-2.04-150300.22.58.1
    * grub2-debuginfo-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro 5.2 (noarch)
    * grub2-i386-pc-2.04-150300.22.58.1
    * grub2-x86_64-xen-2.04-150300.22.58.1
    * grub2-snapper-plugin-2.04-150300.22.58.1
    * grub2-x86_64-efi-2.04-150300.22.58.1
    * grub2-arm64-efi-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro 5.2 (s390x)
    * grub2-s390x-emu-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (aarch64 s390x x86_64)
    * grub2-debugsource-2.04-150300.22.58.1
    * grub2-2.04-150300.22.58.1
    * grub2-debuginfo-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (noarch)
    * grub2-i386-pc-2.04-150300.22.58.1
    * grub2-x86_64-xen-2.04-150300.22.58.1
    * grub2-snapper-plugin-2.04-150300.22.58.1
    * grub2-x86_64-efi-2.04-150300.22.58.1
    * grub2-arm64-efi-2.04-150300.22.58.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (s390x)
    * grub2-s390x-emu-2.04-150300.22.58.1

## References:

  * https://www.suse.com/security/cve/CVE-2024-56738.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1234959

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