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

arm64: percpu: Fix LSE operations on {8,16}-bit types

The assembly for percpu ##name## case ##sz() and percpu ##name## return case ##sz() doesn't use the 'sfx' macro argument to form the LSE instruction. Without 'sfx', a W register argument will imply a 32-bit memory location, and consequently {8,16}-bit ops will erroneously read and write 32 bits of memory when the LSE instruction is used.

Fix this by appending 'sfx' to 'op lse' to LSE instruction. It is not necessary (and not valid) to append 'sfx' to 'op llsc', as 'op llsc' is a register-register operation which does not access memory (and does not take a size suffix).