CVE-2021-34866

HighCVSS 7.8/10Last modified Oct 8, 2026

Description

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-14689.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-843

Affected software

No affected versions have been published.

Timeline

Published
Jan 25, 2022
Last modified
Oct 8, 2026
NVD status
Modified

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CVE-2021-34866: High severity, CVSS 7.8 | Vulnix