CVE-2023-3640

Public on 2023-07-13
Modified on 2024-02-27
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.
Severity
Important severity
Important
CVSS v3 Base Score
7.0
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
HAQM Linux 1 kernel Pending Fix
HAQM Linux 2 - Core kernel Pending Fix
HAQM Linux 2 - Kernel-5.10 Extra kernel Pending Fix
HAQM Linux 2 - Kernel-5.15 Extra kernel Pending Fix
HAQM Linux 2 - Kernel-5.4 Extra kernel Pending Fix
HAQM Linux 2023 kernel Pending Fix

CVSS Scores

Score Type Score Vector
HAQM Linux CVSSv3 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H