SUSE alert SUSE-SU-2026:21621-1 (grub2)

From:
             
 
SLE-SECURITY-UPDATES <null@suse.de>
To:
             
 
sle-security-updates@lists.suse.com
Subject:
             
 
SUSE-SU-2026:21621-1: moderate: Security update for grub2
Date:
             
 
Fri, 15 May 2026 12:32:11 -0000
Message-ID:
             
 
<177884833106.295.16128621240935926868@21fe1a6c7c8c>
# Security update for grub2

Announcement ID: SUSE-SU-2026:21621-1  
Release Date: 2026-05-11T08:46:20Z  
Rating: moderate  
References:

  * bsc#1252930
  * bsc#1252931
  * bsc#1252932
  * bsc#1252933
  * bsc#1252934
  * bsc#1252935

  
Cross-References:

  * CVE-2025-54770
  * CVE-2025-54771
  * CVE-2025-61661
  * CVE-2025-61662
  * CVE-2025-61663
  * CVE-2025-61664

  
CVSS scores:

  * CVE-2025-54770 ( SUSE ):  2.1
    CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-54770 ( SUSE ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-54770 ( NVD ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-54771 ( SUSE ):  2.1
    CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-54771 ( SUSE ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-54771 ( NVD ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-61661 ( SUSE ):  4.3
    CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-61661 ( SUSE ):  4.8 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2025-61661 ( NVD ):  4.8 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2025-61662 ( SUSE ):  2.1
    CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-61662 ( SUSE ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-61662 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-61662 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-61663 ( SUSE ):  2.1
    CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-61663 ( SUSE ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-61663 ( NVD ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-61664 ( SUSE ):  2.1
    CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-61664 ( SUSE ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2025-61664 ( NVD ):  4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

  
Affected Products:

  * SUSE Linux Micro 6.0

  
  
An update that solves six vulnerabilities can now be installed.

## Description:

This update for grub2 fixes the following issues

  * CVE-2025-54770: Missing unregister call for net_set_vlan command may lead to
    use-after-free (bsc#1252930).
  * CVE-2025-54771: grub_file_close() does not properly controls the fs refcount
    (bsc#1252931).
  * CVE-2025-61661: Out-of-bounds write in grub_usb_get_string() function
    (bsc#1252932).
  * CVE-2025-61662: Missing unregister call for gettext command may lead to use-
    after-free (bsc#1252933).
  * CVE-2025-61663: Missing unregister call for normal commands may lead to use-
    after-free (bsc#1252934).
  * CVE-2025-61664: Missing unregister call for normal_exit command may lead to
    use-after-free (bsc#1252935).

Changes for grub2:

  * Bump upstream SBAT generation to 6

## 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 6.0  
    zypper in -t patch SUSE-SLE-Micro-6.0-702=1

## Package List:

  * SUSE Linux Micro 6.0 (aarch64 s390x x86_64)
    * grub2-2.12~rc1-8.1
    * grub2-debugsource-2.12~rc1-8.1
    * grub2-debuginfo-2.12~rc1-8.1
  * SUSE Linux Micro 6.0 (noarch)
    * grub2-snapper-plugin-2.12~rc1-8.1
    * grub2-arm64-efi-2.12~rc1-8.1
    * grub2-i386-pc-2.12~rc1-8.1
    * grub2-x86_64-xen-2.12~rc1-8.1
    * grub2-x86_64-efi-2.12~rc1-8.1
  * SUSE Linux Micro 6.0 (s390x)
    * grub2-s390x-emu-2.12~rc1-8.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-54770.html
  * https://www.suse.com/security/cve/CVE-2025-54771.html
  * https://www.suse.com/security/cve/CVE-2025-61661.html
  * https://www.suse.com/security/cve/CVE-2025-61662.html
  * https://www.suse.com/security/cve/CVE-2025-61663.html
  * https://www.suse.com/security/cve/CVE-2025-61664.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1252930
  * https://bugzilla.suse.com/show_bug.cgi?id=1252931
  * https://bugzilla.suse.com/show_bug.cgi?id=1252932
  * https://bugzilla.suse.com/show_bug.cgi?id=1252933
  * https://bugzilla.suse.com/show_bug.cgi?id=1252934
  * https://bugzilla.suse.com/show_bug.cgi?id=1252935



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