Potential buffer overflow in unsafe UEFI variable handling in Phoenix SecureCore™ for Intel Gemini Lake.This issue affects: SecureCore™ for Intel Gemini Lake: from 4.1.0.1 before 4.1.0.567.

Potential buffer overflow in unsafe UEFI variable handling in Phoenix SecureCore™ for select Intel platforms This issue affects: Phoenix SecureCore™ for Intel Kaby Lake: from 4.0.1.1 before 4.0.1.998; Phoenix SecureCore™ for Intel Coffee Lake: from 4.1.0.1 before 4.1.0.562; Phoenix SecureCore™ for Intel Ice Lake: from 4.2.0.1 before 4.2.0.323; Phoenix SecureCore™ for Intel Comet Lake: from 4.2.1.1 before 4.2.1.287; Phoenix SecureCore™ for Intel Tiger Lake: from 4.3.0.1 before 4.3.0.236; Phoenix SecureCore™ for Intel Jasper Lake: from 4.3.1.1 before 4.3.1.184; Phoenix SecureCore™ for Intel Alder Lake: from 4.4.0.1 before 4.4.0.269; Phoenix SecureCore™ for Intel Raptor Lake: from 4.5.0.1 before 4.5.0.218; Phoenix SecureCore™ for Intel Meteor Lake: from 4.5.1.1 before 4.5.1.15.

IEIT NF5280M6 UEFI firmware through 8.4 has a pool overflow vulnerability, caused by improper use of the gRT->GetVariable() function. Attackers with access to local NVRAM variables can exploit this by modifying these variables on SPI Flash, resulting in memory data being tampered with. When critical data in memory data is tampered with,a crash may occur.

GRUB2 does not call the module fini functions on exit, leading to Debian/Ubuntu's peimage GRUB2 module leaving UEFI system table hooks after exit. This lead to a use-after-free condition, and could possibly lead to secure boot bypass.

An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.

An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. This allows an OS-resident attacker to bypass Secure Boot.

An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the "/boot/" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.

A LogoFAIL issue was discovered in BmpDecoderDxe in Insyde InsydeH2O with kernel 5.2 before 05.28.47, 5.3 before 05.37.47, 5.4 before 05.45.47, 5.5 before 05.53.47, and 5.6 before 05.60.47 for certain Lenovo devices. Image parsing of crafted BMP logo files can copy data to a specific address during the DXE phase of UEFI execution. This occurs because of an integer signedness error involving PixelHeight and PixelWidth during RLE4/RLE8 compression.

Memory corruption in Boot while running a ListVars test in UEFI Menu during boot.

Improper initialization in some Intel(R) Aptio* V UEFI Firmware Integrator Tools may allow an authenticated user to potentially enable escalation of privilege via local access.