CVE-2023-3640

HIGH EPSS 49.2%
Published Jul 24, 20232y ago · Modified Jun 26, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Jul 24, 2023 2y ago
Last Modified Jun 26, 2026 1w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
49.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-203
CWE-385

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*any
redhatenterprise_linux8.0any
redhatenterprise_linux9.0any

References 3

  • access.redhat.com https://access.redhat.com/errata/RHSA-2023:6583
  • access.redhat.com https://access.redhat.com/security/cve/CVE-2023-3640
    Third Party Advisory
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2217523
    Issue TrackingThird Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.