CVE-2023-3640

A possible unauthorized memory access flaw was found in the Linux kernel’s
cpu_entry_area mapping of X86 CPU data to memory, where a user may guess
the location of exception stacks or other important data. Based on the
previous CVE-2023-0597, the ‘Randomize per-cpu entry area’ feature was
implemented in /arch/x86/mm/cpu_entry_area.c, which works through the
init_cea_offsets() function when KASLR is enabled. However, despite this
feature, there is still a risk of per-cpu entry area leaks. This issue
could allow a local user to gain access to some important data with memory
in an expected location and potentially escalate their privileges on the
system.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=2217523&gt;
• <https://bugzilla.suse.com/show_bug.cgi?id=1213271&gt;

Notes