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…

Browse: All 2021 CVEs · All vendors

CVSS score
6.6 Medium
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
CISA KEV
Yes — actively exploited (added 2022-04-11, remediation due 2022-05-02)
Weakness (CWE)
CWE-415
Published
2022-01-26
Last modified
2026-06-17
NVD status
Analyzed

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

Affected products

Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.

Required action (CISA)

Apply updates per vendor instructions. Federal remediation deadline: 2022-05-02.

How to prioritize this

This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score. For the actively exploited vulnerabilities that matter this week, read The Exploit HQ daily security brief.

References

FAQ

Is CVE-2021-22600 actively exploited?

Yes. CISA added CVE-2021-22600 to its Known Exploited Vulnerabilities (KEV) catalog on 2022-04-11, with a federal remediation deadline of 2022-05-02. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.

What is the CVSS score of CVE-2021-22600?

CVE-2021-22600 has a CVSS base score of 6.6 (Medium). Its vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H.

Related vulnerabilities

Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.