What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-25 · updated 2026-06-17
• Weakness: CWE-763

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

Affected products

• Linux kernel: before 4.14.307; from 4.19.0 before 4.19.274; from 5.4.0 before 5.4.233; from 5.10.0 before 5.10.170; from 5.15.0 before 5.15.96; from 6.1.0 before 6.1.14 — fixed in 4.14.307, 4.19.274, 5.10.170, 5.15.96, 5.4.233, 6.1.14

How to fix

Upgrade to a fixed version: Linux kernel 4.14.307, 4.19.274, 5.10.170, 5.15.96. Check the vendor advisory for mitigations.

References

• https://github.com/torvalds/linux/commit/4b842e4e25b12951fa10dedb4bc16bc47e3b850c
• https://github.com/torvalds/linux/commit/74e19ef0ff8061ef55957c3abd71614ef0f42f47
• https://github.com/torvalds/linux/commit/4b842e4e25b12951fa10dedb4bc16bc47e3b850c
• https://github.com/torvalds/linux/commit/74e19ef0ff8061ef55957c3abd71614ef0f42f47

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