CVE-2023-0459

Name: CVE-2023-0459
Creator: NVD / NIST
Published: 2023-05-25T14:15:09.603+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2023-0459 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Copy_from_user on 64-bit versions of the Linux kernel does not implement the __uaccess_begin_nospec allowing a user to bypass the "access_ok" check and pass a kernel pointer to copy_from_user(). This would allow an attacker to leak information. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

Copy_from_user on 64-bit versions of the Linux kernel does not implement the __uaccess_begin_nospec allowing a user to bypass the "access_ok" check and pass a kernel pointer to copy_from_user(). This would allow an attacker to leak information. We recommend upgrading beyond commit 74e19ef0ff8061ef55957c3abd71614ef0f42f47

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.64%

45.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 4.14.307
Linux	Linux Kernel	>= 4.19.0, < 4.19.274
Linux	Linux Kernel	>= 5.4.0, < 5.4.233
Linux	Linux Kernel	>= 5.10.0, < 5.10.170
Linux	Linux Kernel	>= 5.15.0, < 5.15.96
Linux	Linux Kernel	>= 6.1.0, < 6.1.14
Linux	Linux Kernel	>= 6.2.0, < 6.2.1

References

Timeline

Published: May 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-0459?

How severe is CVE-2023-0459?

CVE-2023-0459 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2023-0459?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-0459?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST