CVE-2023-3640

Summary

CVE-2023-3640 is a vulnerability affecting the Linux kernel that involves a possible unauthorized memory access issue. The flaw is related to the cpu_entry_area mapping of X86 CPU data to memory, where a local user may be able to guess the location of exception stacks or other sensitive data. Previously, the 'Randomize per-cpu entry area' feature was implemented to mitigate such risks, but it seems that per-cpu entry area leaks still exist. This issue could allow a local user to access important data and potentially escalate their privileges on the system. This vulnerability was identified in the init_cea_offsets() function when Kernel Address Space Layout Randomization (KASLR) is enabled.

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