From 732 bytes to nowhere: shutting down Copy Fail in production
Quick Answer
Together AI swiftly mitigated the Copy Fail vulnerability (CVE-2026-31431) by disabling the algif_aead interface across its infrastructure, preventing potential privilege escalation and cross-tenant risks in AI workloads.
Quick Take
This proactive measure ensured minimal operational impact while maintaining security in shared kernel environments.
Key Points
- Copy Fail allows unprivileged users to exploit writable page cache in Linux.
- Disabling algif_aead mitigated risks without requiring system reboots.
- Kernel patches will be rolled out gradually after thorough testing.
- Detection teams implemented monitoring for unexpected AF_ALG usage.
- Narrow interfaces can unexpectedly become significant attack surfaces.
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