# 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

- Page: https://www.vulneraibility.com/cve/CVE-2021-22600
- CVSS: 6.6
- Known exploited: yes, in CISA KEV since 2022-04-11; CISA due date 2022-05-02
- EPSS: 6.59% (percentile 93.9)
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2025-06-22)
- CISA SSVC: exploitation active, automatable no, technical impact partial (assessed 2025-01-29)
- Weakness: CWE-415
- Published: 2022-01-26

## Affected versions

- Linux Kernel Kernel: affected < 5.4.168; < 5.10.88; < 5.15.11; < 5.16-rc6

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755
- [other] https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- [advisory] https://www.debian.org/security/2022/dsa-5096
- [other] https://security.netapp.com/advisory/ntap-20230110-0002/
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.