Security update for grub2 SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:21223-1 Final 1 1 2025-12-15T12:49:56Z current 2025-12-15T12:49:56Z 2025-12-15T12:49:56Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for grub2 This update for grub2 fixes the following issues: Changes in grub2: - CVE-2025-54771: Fixed grub_file_close() does not properly controls the fs refcount (bsc#1252931) - CVE-2025-54770: Fixed missing unregister call for net_set_vlan command may lead to use-after-free (bsc#1252930) - CVE-2025-61662: Fixed missing unregister call for gettext command may lead to use-after-free (bsc#1252933) - CVE-2025-61663: Fixed missing unregister call for normal commands may lead to use-after-free (bsc#1252934) - CVE-2025-61664: Fixed missing unregister call for normal_exit command may lead to use-after-free (bsc#1252935) - CVE-2025-61661: Fixed out-of-bounds write in grub_usb_get_string() function (bsc#1252932) - Bump upstream SBAT generation to 6 - Fix "sparse file not allowed" error after grub2-reboot (bsc#1245738) - Fix PowerPC network boot prefix to correctly locate grub.cfg (bsc#1249385) - turn off page flipping for i386-pc using VBE video backend (bsc#1245636) - Fix boot hangs in setting up serial console when ACPI SPCR table is present and redirection is disabled (bsc#1249088) - Fix timeout when loading initrd via http after PPC CAS reboot (bsc#1245953) - Skip mount point in grub_find_device function (bsc#1246231) - CVE-2024-56738: Fixed side-channel attack due to not constant-time algorithm in grub_crypto_memcmp (bsc#1234959) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-SL-Micro-6.2-106 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ Link for SUSE-SU-2025:21223-1 https://lists.suse.com/pipermail/sle-security-updates/2025-December/023588.html E-Mail link for SUSE-SU-2025:21223-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1234959 SUSE Bug 1234959 https://bugzilla.suse.com/1245636 SUSE Bug 1245636 https://bugzilla.suse.com/1245738 SUSE Bug 1245738 https://bugzilla.suse.com/1245953 SUSE Bug 1245953 https://bugzilla.suse.com/1246231 SUSE Bug 1246231 https://bugzilla.suse.com/1247242 SUSE Bug 1247242 https://bugzilla.suse.com/1249088 SUSE Bug 1249088 https://bugzilla.suse.com/1249385 SUSE Bug 1249385 https://bugzilla.suse.com/1252930 SUSE Bug 1252930 https://bugzilla.suse.com/1252931 SUSE Bug 1252931 https://bugzilla.suse.com/1252932 SUSE Bug 1252932 https://bugzilla.suse.com/1252933 SUSE Bug 1252933 https://bugzilla.suse.com/1252934 SUSE Bug 1252934 https://bugzilla.suse.com/1252935 SUSE Bug 1252935 https://www.suse.com/security/cve/CVE-2024-56738/ SUSE CVE CVE-2024-56738 page https://www.suse.com/security/cve/CVE-2025-54770/ SUSE CVE CVE-2025-54770 page https://www.suse.com/security/cve/CVE-2025-54771/ SUSE CVE CVE-2025-54771 page https://www.suse.com/security/cve/CVE-2025-61661/ SUSE CVE CVE-2025-61661 page https://www.suse.com/security/cve/CVE-2025-61662/ SUSE CVE CVE-2025-61662 page https://www.suse.com/security/cve/CVE-2025-61663/ SUSE CVE CVE-2025-61663 page https://www.suse.com/security/cve/CVE-2025-61664/ SUSE CVE CVE-2025-61664 page SUSE Linux Micro 6.2 grub2-2.12-160000.3.1 grub2-arm64-efi-2.12-160000.3.1 grub2-common-2.12-160000.3.1 grub2-i386-pc-2.12-160000.3.1 grub2-powerpc-ieee1275-2.12-160000.3.1 grub2-s390x-emu-2.12-160000.3.1 grub2-snapper-plugin-2.12-160000.3.1 grub2-x86_64-efi-2.12-160000.3.1 grub2-x86_64-xen-2.12-160000.3.1 grub2-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-arm64-efi-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-common-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-i386-pc-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-powerpc-ieee1275-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-s390x-emu-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-snapper-plugin-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-x86_64-efi-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 grub2-x86_64-xen-2.12-160000.3.1 as a component of SUSE Linux Micro 6.2 GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks. CVE-2024-56738 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2024-56738.html CVE-2024-56738 https://bugzilla.suse.com/1234959 SUSE Bug 1234959 A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability CVE-2025-54770 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-54770.html CVE-2025-54770 https://bugzilla.suse.com/1252930 SUSE Bug 1252930 A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader). The flaw occurs because the file-closing process incorrectly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded. CVE-2025-54771 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-54771.html CVE-2025-54771 https://bugzilla.suse.com/1252931 SUSE Bug 1252931 A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited. CVE-2025-61661 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-61661.html CVE-2025-61661 https://bugzilla.suse.com/1252932 SUSE Bug 1252932 A Use-After-Free vulnerability has been discovered in GRUB's gettext module. This flaw stems from a programming error where the gettext command remains registered in memory after its module is unloaded. An attacker can exploit this condition by invoking the orphaned command, causing the application to access a memory location that is no longer valid. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded. CVE-2025-61662 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-61662.html CVE-2025-61662 https://bugzilla.suse.com/1252933 SUSE Bug 1252933 A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded. CVE-2025-61663 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-61663.html CVE-2025-61663 https://bugzilla.suse.com/1252934 SUSE Bug 1252934 A vulnerability in the GRUB2 bootloader has been identified in the normal module. This flaw, a memory Use After Free issue, occurs because the normal_exit command is not properly unregistered when its related module is unloaded. An attacker can exploit this condition by invoking the command after the module has been removed, causing the system to improperly access a previously freed memory location. This leads to a system crash or possible impacts in data confidentiality and integrity. CVE-2025-61664 SUSE Linux Micro 6.2:grub2-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-arm64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-common-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-i386-pc-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-powerpc-ieee1275-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-s390x-emu-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-snapper-plugin-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-efi-2.12-160000.3.1 SUSE Linux Micro 6.2:grub2-x86_64-xen-2.12-160000.3.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202521223-1/ https://www.suse.com/security/cve/CVE-2025-61664.html CVE-2025-61664 https://bugzilla.suse.com/1252935 SUSE Bug 1252935