The string component in the GNU C Library (aka glibc or libc6) through 2.28 when running on the x32 architecture incorrectly attempts to use a 64-bit register for size_t in assembly codes which can lead to a segmentation fault or possibly unspecified other impact as demonstrated by a crash in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy.

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