CVE-2021-22600

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

CVSS v3.1

7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

6.6 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H

CVSS v2.0

7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS

6.08% chance of exploitation in the next 30 days, 93th percentile

CISA KEV

added 2022-04-11

Published

2022-01-26

Updated

2025-10-21

Proof-of-concept exploits (2)

• r4j0x00/exploits2525★ · 2023-01-02
• sendINUX/CVE-2021-22600__DirtyPagetable1★ · 2025-08-29

References

• CVE Record
• NVD entry

Related

• CVE-2020-16040
• CVE-2020-6507
• CVE-2021-3156
• CVE-2021-22573
• CVE-2021-2264
• CVE-2021-22557