CVE-2023-0459

Copy_from_user Spectre-V1 Gadget in Linux Kernel

MEDIUM

5.5

CVSS Score

Published: May 25, 2023 at 01:22 PM UTC

Updated: June 17, 2026 at 05:25 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v < 4.14.3074.19.0 ≤ v < 4.19.2745.10.0 ≤ v < 5.10.1705.15.0 ≤ v < 5.15.965.4.0 ≤ v < 5.4.2336.1.0 ≤ v < 6.1.146.2.0 ≤ v < 6.2.14b842e4e25b12951fa10dedb4bc16bc47e3b850c

Affected range stops below 4.14.307, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.19.274, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.10.170, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.15.96, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.4.233, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.1.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch

Source: [email protected]

https://github.com/torvalds/linux/commit/4b842e4e25b12951fa10dedb4bc16bc47e3b850c

Patch

Source: [email protected]

https://github.com/torvalds/linux/commit/74e19ef0ff8061ef55957c3abd71614ef0f42f47

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-763

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