CVE-2021-22600
Double Free in net/packet/af_packet.c leading to priviledge escalation
- Published
- Jan 26, 2022
- Updated
- Oct 21, 2025
- Assigning CNA
- Evidence observed
- Apr 11, 2022
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 93.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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
Sources
3- af_packet.cPoC
Proof-Of-Concept to check privileges of af_packet.c for validating the privileges acquired by any hacker upon successful exploitation of CVE-2021-22600
- exploitsExploit
Proof-of-concept exploit collection targeting Linux kernel LPE, sudo heap overflow, and Chrome V8 OOB write vulnerabilities for penetration testing.
Educational Linux kernel exploit for CVE-2021-22600 using the DirtyPagetable technique to achieve local privilege escalation.
Responsible use
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