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[ CVE-2021-22600 · Published 26 Jan 2022 ]

Linux Kernel Privilege Escalation Vulnerability

Exploited · CISA KEV CVSS 7.0 EPSS 7%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-04-11

[ Description ]Official description

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

CISA: Linux Kernel contains a flaw in the packet socket (AF_PACKET) implementation which could lead to incorrectly freeing memory. A local user could exploit this for denial-of-service (DoS) or possibly for privilege escalation.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 2 May 2022): Apply updates per vendor instructions.

[ References ]References