{"id":"CVE-2023-3640","details":"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.","modified":"2026-03-13T07:39:19.064413Z","published":"2023-07-24T16:15:13.063Z","related":["CGA-fwwg-5xv9-v2qj"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2023-3640"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2023:6583"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2217523"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-3640.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}