CVE-2023-52664

What it actually does

Double-free condition in Atlantic network driver ring allocation due to repeated aq_ring_free calls on the same ring when memory allocation fails under stress; ring pointer misused as failure indicator instead of returning error codes directly.

Why it matters to the business

System instability, crashes, or local privilege escalation on Linux systems using Atlantic adapters during high-load or memory-constrained scenarios; low immediate urgency given low EPSS and no KEV status but still requires patching in affected kernels.

How an attack unfolds

Local attacker induces memory pressure to trigger allocation failures during ring setup in the driver error path, causing the double-free to corrupt kernel memory structures for potential code execution.

How to fix it

Update the Linux kernel to a version containing the fix that changes ring allocation functions to return error codes directly and eliminates redundant aq_ring_free calls; apply available fixed packages for affected distributions.

How to confirm the fix worked

Confirm kernel version includes the upstream commit resolving the double-free logic; review driver source for direct error return paths in aq_ring allocation; test ring allocation under simulated memory pressure.

Typical attack path

1. Trigger sustained memory allocation pressure on the host
2. Initiate network interface configuration or reset that exercises Atlantic ring allocation
3. Force the error path that incorrectly re-invokes aq_ring_free
4. Leverage resulting kernel heap corruption for privilege escalation

How to detect it

Review kernel logs for repeated aq_ring allocation failures or double-free warnings around Atlantic driver initialization; inspect crash dumps for heap corruption signatures in ring structures.

What your security team should do

• Prioritize kernel updates on systems with Atlantic network hardware
• Monitor EPSS trend for any increase indicating rising exploit interest
• Restrict untrusted local access on multi-user systems until patched