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.
Advisories
Source ID Title
EUVD EUVD EUVD-2021-21513 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 08 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: zdi

Published:

Updated: 2026-10-08T21:03:25.520Z

Reserved: 2021-06-17T00:00:00.000Z

Link: CVE-2021-34866

cve-icon Vulnrichment

Updated: 2024-08-04T00:26:54.201Z

cve-icon NVD

Status : Modified

Published: 2022-01-25T16:15:08.450

Modified: 2026-10-08T21:17:36.293

Link: CVE-2021-34866

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-10-13T12:00:00Z

Links: CVE-2021-34866 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses