Suspicious OverlayFS Mount with Writable Upperdir for GameOverlay Exploitation (via process_creation)

ATT&CK techniques

Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1068Exploitation for Privilege Escalation
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a mount command creating an OverlayFS with a writable upperdir and workdir, the filesystem layout the GameOverlay Ubuntu exploit builds to trigger the vulnerable capability copy-up in the kernel. Manual OverlayFS mounts of this shape by unprivileged users are a hallmark of the exploit sequence and warrant investigation.

Reporting behind it

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Suspicious OverlayFS Mount with Writable Upperdir for GameOverlay Exploitation (via process_creation)

Pivot detection · T1068 · 9 related

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