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Weekly-Breach-Investigation--006 — Repository documenting the Copy Fail (CVE-2026-31431) Linux kernel vulnerability, a local privilege escalation flaw enabling root access and mapped to MITRE ATT&CK techniques. | Kitploit
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GitHubjamal-soc21/weekly-breach-investigation--006

Weekly-Breach-Investigation--006

Repository documenting the Copy Fail (CVE-2026-31431) Linux kernel vulnerability, a local privilege escalation flaw enabling root access and mapped to MITRE ATT&CK techniques.

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13 months agoNot yet reviewed

Copy Fail Vulnerability (CVE-2026-31431)

Summary

High-severity local privilege escalation flaw in the Linux kernel, allowing unprivileged users to gain root access by corrupting the in-memory page cache. Impacts Linux distributions since 2017 and poses serious risks to cloud and containerized environments.

Detection

  • Added to CISA KEV catalog (May 2026)
  • Exploitation observed in the wild
  • PoCs available in Python, Go, and Rust

MITRE ATT&CK Mapping

  • Privilege Escalation: Abuse Elevation Control Mechanism (T1548)
  • Privilege Escalation: Access Token Manipulation (T1134)
  • Execution: Command and Scripting Interpreter (T1059)
  • Defense Evasion: Masquerading / Legitimate Syscalls (T1036)

Mitigation

  • Patch to kernel versions 6.18.22, 6.19.12, or 7.0
  • Disable vulnerable feature if patching is delayed
  • Restrict container access to AF_ALG subsystem
  • Apply network isolation and access controls

Conclusion

Techniques and behaviors were mapped to the MITRE ATT&CK framework for structured analysis and standardized classification

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