CVE-2024-43847

What it actually does

The monitor ring and reo reinject ring share a ring mask index; an interrupt for the reo reinject ring also triggers monitor ring processing, resulting in invalid memory access when handling fragmented packets in the ath12k driver.

Why it matters to the business

Potential kernel crashes or memory corruption on affected wireless hardware, disrupting network operations across devices with 404 downstream dependents; low EPSS indicates limited observed exploitation but still requires attention given publication in 2024.

How an attack unfolds

An attacker sends specially crafted fragmented wireless packets that trigger the shared ring interrupt path; the driver then accesses uninitialized or invalid monitor ring memory, leading to corruption or a crash.

How to fix it

Update to fixed versions where available; for aiohttp (PyPI) upgrade to 3.9.0; apply the kernel patch that removes the monitor ring mask until support is enabled.

How to confirm the fix worked

Confirm the ring mask configuration no longer includes the monitor ring index and test with fragmented packet workloads on QCN9274 hardware; verify no invalid memory accesses occur in logs.

Typical attack path

1. Send crafted 802.11 fragmented packets targeting the vulnerable ath12k hardware
2. Trigger reo reinject ring interrupt via packet processing
3. Force concurrent monitor ring handling due to shared mask
4. Cause invalid memory read/write leading to crash or corruption

How to detect it

Review kernel logs for ath12k ring processing errors or invalid memory access faults around wifi interrupt handling; check for unexpected crashes on systems with QCN9274 hardware.

What your security team should do

• Prioritize patching systems using affected ath12k wireless hardware
• Monitor for kernel oops or memory corruption events related to wifi rings
• Disable monitor mode support if not required