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The public catalogue of detection rules. Every entry carries its source, the identifier it had there, its licence and its ATT&CK mapping.

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HighElastic detection rules

Potential Copy Fail (CVE-2026-31431) Exploitation via AF_ALG Socket

Correlates a burst of non-root AF_ALG-class "socket", "splice", or "bound-socket" telemetry with a subsequent process execution where effective user is root but the login user remains non-root. This sequence matches common post-exploitation chains for Copy Fail (CVE-2026-31431) style abuse where AF_ALG and "splice" primitives precede executing a corrupted setuid binary from cache.

ATT&CK coverage

Privilege Escalation

T1068Exploitation for Privilege Escalation 131 detections cover this technique
T1548Abuse Elevation Control Mechanism109 detections cover this technique
- T1548.001Setuid and Setgid 32 detections cover this technique

Detection requirements

Log source category: event_index

Detection logic

Published to signed-in readers

The query as its source wrote it, its canonical form, and the content hash that pins this exact revision.

Provenance

Where this detection came from, and what you may do with it.

At source: Open at source
Written by: Elastic
Licence: Elastic License 2.0Read the licence
Published: Aug 27, 2026
Version: 1