From Exploit Code to Production Detection: Building a CVE-2026-31431 (Copy Fail) detection with Agents
CVE-2026-31431 (Copy Fail) lets any unprivileged user corrupt the Linux page cache via AF_ALG sockets to escalate privileges. This post covers the exploit mechanics and how Datadog Security Research used coding agents to ship a detection content pack in a single session.
Summary from Datadog Security Labs.
Explained
The technology and terms in this story. Learn more
- AttackPrivilege escalationGoing from limited access to more powerful access, such as from a normal user to administrator.
- ConceptExploitCode or a technique that turns a software flaw into something an attacker can actually use.
- ConceptCVE · Common Vulnerabilities and ExposuresThe public ID system for vulnerabilities, such as CVE-2026-12345, so everyone means the same bug.
Vulnerabilities in this story
Severity and exploitation facts from NVD, FIRST, and CISA.
Related coverage
Other sources covering the same vulnerabilities or event.
