CVE-2021-22600
Actively exploited. CVE-2021-22600 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2021-22600 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Linux Kernel contains a flaw in the packet socket (AF_PACKET) implementation which could lead to incorrectly freeing memory. A local user could exploit this for denial-of-service (DoS) or possibly for privilege escalation.
CSIRTS triage
- What
- The vulnerability in the packet socket implementation could lead to incorrectly freeing memory.
- Who is affected
- Local users of the Linux Kernel are affected.
- Urgency
- Remediation is urgent due to the potential for privilege escalation and denial-of-service exploitation.
- Action
- Apply the latest patches for the Linux Kernel.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 92% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2021-22600 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2021-22600: Linux Kernel Privilege Escalation Vulnerabilitycisa-kev · 2022-04-11
External references
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[](https://www.csirts.com/cve/CVE-2021-22600)