CVE-2023-46103

What it actually does

A sequence of processor instructions triggers unexpected behavior in affected Intel Core Ultra processors, resulting in a denial of service condition that halts or degrades system availability.

Why it matters to the business

Systems using vulnerable processors may experience unexpected crashes or unavailability, disrupting operations and requiring restarts, with low likelihood but potential impact on availability-critical workloads.

How an attack unfolds

An authenticated local user crafts and executes a specific sequence of processor instructions that exploits the flaw, leading to system instability or denial of service.

How to fix it

Apply the latest Intel microcode updates or BIOS/firmware updates that address the processor behavior issue.

How to confirm the fix worked

Verify processor model against affected list, confirm microcode version is updated, test for stability under load.

Typical attack path

1. Gain local authenticated access to a system with affected processor
2. Execute crafted instruction sequence
3. Trigger unexpected processor behavior causing DoS

How to detect it

Monitor system logs for unexpected crashes or hangs on affected hardware, review processor event logs for anomalies related to instruction execution.

What your security team should do

• Identify systems with Intel Core Ultra processors
• Apply firmware and microcode updates promptly
• Monitor for system instability indicators