CVE-2023-0459 Copy_from_user Spectre-V1 Gadget in Linux Kernel

What is CVE-2023-0459?

CVE-2023-0459 is a medium-severity vulnerability in Linux kernel, published on 25 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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

Weakness: CWE-763

Which versions are affected by CVE-2023-0459?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-0459?

Apply the vendor's patch.

Is CVE-2023-0459 being exploited?

There is no known exploitation of CVE-2023-0459 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-26953, DEBIAN-CVE-2023-0459, GHSA-82f5-ghc6-rj5c, UBUNTU-CVE-2023-0459.