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

ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow

Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from
VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in
__switch_to(). The read uses ldr, but the KASAN shadow address is
byte-granular and is not guaranteed to be word aligned.

ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and
CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()
with an alignment exception before reaching init.

Use ldrb for the dummy shadow access. The code only needs to fault in the
shadow mapping if the stack shadow is missing, so a byte load is sufficient
and matches the granularity of KASAN shadow memory.

https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9

https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e

https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6

https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4

https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2

https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c

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