CVE-2026-53343

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow<br /> <br /> Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from<br /> VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in<br /> __switch_to(). The read uses ldr, but the KASAN shadow address is<br /> byte-granular and is not guaranteed to be word aligned.<br /> <br /> ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and<br /> CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()<br /> with an alignment exception before reaching init.<br /> <br /> Use ldrb for the dummy shadow access. The code only needs to fault in the<br /> shadow mapping if the stack shadow is missing, so a byte load is sufficient<br /> and matches the granularity of KASAN shadow memory.