CVE-2021-34866

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.

• CWE-843
• CWE-843

• https://security.netapp.com/advisory/ntap-20220217-0008/Third Party Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-1148/Third Party Advisory, VDB Entry
• https://security.netapp.com/advisory/ntap-20220217-0008/Third Party Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-1148/Third Party Advisory, VDB Entry

Published

Jan 25, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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