CVE-2026-68401

In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit()

Sashiko (locally) reports multiple out-of-bound issues in

ffa_setup_and_transmit:

1) Writing ep_mem_access->reserved can write out of bounds for FFA

versions < 1.2 as ffa_emad_size_get() returns 16 bytes in that case

while reserved has an offset of 24.

Instead of zeroing fields, memset the struct to zero first based on

the FFA version.

2) Make sure there is enough size to write constituents.

While at it, convert the only sizeof() in the driver that uses a

type instead of variable.