Is CVE-2023-3640 actively exploited?

No active exploitation of CVE-2023-3640 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-3640 be exploited remotely?

No. CVE-2023-3640 requires local access to exploit.

What is the CVSS score of CVE-2023-3640?

CVE-2023-3640 has a CVSS score of 7.8 (HIGH).

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HIGH

CVE-2023-3640

CWE-385Published: July 24, 2023· Updated: Jun 26, 2026

7.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-3640 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.