CVE-2021-22600
Double Free in net/packet/af_packet.c leading to priviledge escalation
KEVHIGH 7.0EPSS 6.6%
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
- Affected
- Linux Kernel · Kernel
- CVSS v3.1 NVD
- 7.0 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GOOGLE
- 6.6 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H - CVSS v2.0 NVD
- 7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C - EPSS
- 6.59% chance of exploitation in the next 30 days, 94th percentile
- CISA KEV
- added 2022-04-11
- Published
- 2022-01-26
- Updated
- 2025-10-21
Proof-of-concept exploits (2)
- r4j0x00/exploits2522★ · 2023-01-02
- sendINUX/CVE-2021-22600__DirtyPagetable1★ · 2025-08-29
Security advisories
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://security.netapp.com/advisory/ntap-20230110-0002
- https://www.debian.org/security/2022/dsa-5096
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28…