What is CVE-2023-0459?

CVE-2023-0459 is a medium-severity vulnerability in Linux Kernel, classified under Release of Invalid Pointer or Reference. CVSS score: 6.5/10. Published 2023-05-25.

How severe is CVE-2023-0459?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Linux Kernel

CVE-2023-0459

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

Published 2023-05-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (49.4th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Linux Kernel — versions 4b842e4e25b12951fa10dedb4bc16bc47e3b850c
Linux Kernel

Weakness classification (CWE)

CWE-763 — Release of Invalid Pointer or Reference

References

Frequently asked questions

What is CVE-2023-0459?: CVE-2023-0459 is a medium-severity vulnerability in Linux Kernel, classified under Release of Invalid Pointer or Reference. CVSS score: 6.5/10. Published 2023-05-25.
How severe is CVE-2023-0459?: Medium severity. CVSS v3 base score is 6.5 out of 10.