In the Linux kernel, the following vulnerability has been resolved: ASoC: cs-amp-lib: Fix NULL pointer crash if efi.get_variable is NULL Call efi_rt_services_supported() to check that efi.get_variable exists before calling it.
https://git.kernel.org/stable/c/dc268085e499666b9f4f0fcb4c5a94e1c0b193b3
https://git.kernel.org/stable/c/5b6baaa7cbd77ff980516bad38bbc5a648bb5158