PT-2023-3677 · Linux+3 · Linux Kernel+3

Alex · Published 2023-06-23 · Updated 2026-03-14 · CVE-2023-3640

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the init cea offsets() function in the /arch/x86/mm/cpu entry area.c module of the Linux kernel's memory management subsystem. It concerns the accessibility of the per-cpu area of memory to user address space. Exploitation of this issue may allow an attacker to access protected information and potentially escalate their privileges. A feature called 'Randomize per-cpu entry area' was implemented to mitigate similar issues, but despite this, there is still a risk of per-cpu entry area leaks. This could enable a local user to gain access to important data in memory and potentially escalate their privileges on the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Side Channel Attack

Improper Access Control

Weakness Enumeration

CWE-203

CWE-284

Related Identifiers

ALSA-2025_12746

ALSA-2025_12752

ALSA-2025_12753

ALSA-2025_16880

ALSA-2025_16919

ALSA-2025_16920

ALSA-2025_18281

ALSA-2025_19102

ALSA-2025_19103

ALSA-2025_19409

ALSA-2025_22800

ALSA-2025_22801

BDU:2023-03962

CVE-2023-3640

ECHO-3758-6C42-61D3

RHSA-2023:6583

RHSA-2023_6583

ROSA-SA-2023-2241

Affected Products

Debian

Linux Kernel

Red Hat

Red Os

References · 22

• 🔥 https://github.com/pray77/CVE-2023-3640 · Exploit
• https://bdu.fstec.ru/vul/2023-03962 · Security Note
• https://cve.org/CVERecord?id=CVE-2023-3640 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2023-3640 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-3640 · Security Note
• https://osv.dev/vulnerability/CVE-2023-3640 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2023-3640 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-3640 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-3640 · Vendor Advisory
• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2023-3640 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2023:6583 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-3640 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-3640 · Vendor Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1213271 · Note