The grub2 package before 2.02-0.29 in Red Hat Enterprise Linux (RHEL) 7, when used on UEFI systems, allows local users to bypass intended Secure Boot restrictions and execute non-verified code via a crafted (1) multiboot or (2) multiboot2 module in the configuration file or physically proximate attackers to bypass intended Secure Boot restrictions and execute non-verified code via the (3) boot menu.

IBM Unified Extensible Firmware Interface (UEFI) on Flex System x880 X6, System x3850 X6, and System x3950 X6 devices allows remote authenticated users to cause an unspecified temporary denial of service by using privileged access to enable a legacy boot mode.

In the Linux kernel, the following vulnerability has been resolved: arm64: hibernate: Fix level3 translation fault in swsusp_save() On arm64 machines, swsusp_save() faults if it attempts to access MEMBLOCK_NOMAP memory ranges. This can be reproduced in QEMU using UEFI when booting with rodata=off debug_pagealloc=off and CONFIG_KFENCE=n: Unable to handle kernel paging request at virtual address ffffff8000000000 Mem abort info: ESR = 0x0000000096000007 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000eeb0b000 [ffffff8000000000] pgd=180000217fff9803, p4d=180000217fff9803, pud=180000217fff9803, pmd=180000217fff8803, pte=0000000000000000 Internal error: Oops: 0000000096000007 [#1] SMP…