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CVE-2023-3640 is a vulnerability in the Linux kernel's implementation of the cpu_entry_area mapping for X86 architectures. The flaw arises from insufficient randomization of the per-cpu entry area, even after the introduction of the 'Randomize per-cpu entry area' feature in /arch/x86/mm/cpu_entry_area.c (init_cea_offsets()) when KASLR is enabled. This allows a local attacker to potentially guess the location of exception stacks or other sensitive per-cpu data, leading to possible unauthorized memory access.
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