What is CVE-2023-3640?

CVE-2023-3640 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10. CVE-2023-3640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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

CVE-2023-3640 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2023-3640?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2023-3640 patch availability.

Is CVE-2023-3640 actively exploited?

CVE-2023-3640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-3640

High

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.

Package Linux Kernel

Published 2023-07-24

Last modified 2026-07-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-385

CVE-2023-3640 is classified as CWE-385

See CWE-385 on MITRE CWE for full details on this weakness type.

References

3 total

Red Hat
https://access.redhat.com/errata/RHSA-2023:6583
Red Hat
https://access.redhat.com/security/cve/CVE-2023-3640

Third Party Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=2217523

Issue Tracking Third Party Advisory

Details

CVE ID CVE-2023-3640

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2023-07-24

Modified 2026-07-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2023-3640?

CVE-2023-3640 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2023-3640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-3640?

CVE-2023-3640 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2023-3640?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2023-3640 patch availability.
Is CVE-2023-3640 actively exploited?

No. CVE-2023-3640 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.