SUSE-SU-2025:21212-1

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)