CVE-2024-46861

What it actually does

RX callback failures in the ipheth driver cause the network receive path to stop processing further URBs, leading to a hung network interface.

Why it matters to the business

Systems using affected Linux kernel versions for iPhone tethering or similar USB networking may lose network connectivity after encountering malformed packets or resource issues, with low but present exploitation risk from listed campaigns.

How an attack unfolds

An attacker sends short, malformed NCM-framed payloads or induces memory pressure to trigger RX callback failures in the ipheth driver; prior to the fix this halts all further incoming packet processing, resulting in denial of service. Threat actors in 2024 Zero-Day Exploitation Campaigns by Espionage and Financially Motivated Actors as well as those targeting Linux Kernel Use of Uninitialized Resource and Out-of-Bounds Write issues have shown interest in similar kernel networking flaws.

How to fix it

Update the Linux kernel to commit 4d1cfa3afb8627435744ecdc6d8b58bc72ee0f4c or later stable releases containing the fix; for github.com/keep-network/keep-ecdsa update to version 1.8.1 or newer if dependencies are present.

How to confirm the fix worked

Confirm the kernel source contains the change that treats RX callback failures as non-fatal and continues URB processing; test by injecting malformed NCM frames and verifying the interface remains operational.

Typical attack path

1. Identify target systems using ipheth USB networking driver
2. Craft and deliver short or incorrectly formatted NCM payloads over the USB interface
3. Trigger memory pressure or framing errors to induce RX callback failure
4. Observe driver seize-up and loss of network receive capability

How to detect it

Search kernel logs and dmesg for ipheth RX callback error messages preceding network interface resets; correlate with USB URB submission failures and monitor for sudden cessation of network traffic on tethered interfaces. Review activity from listed threat actors targeting Linux kernel vulnerabilities.

What your security team should do

• Prioritize kernel upgrades on all systems exposing the ipheth driver due to 745 days of exposure
• Monitor EPSS trend and threat actor activity around Linux kernel networking components
• Apply the exact fixed commit 4d1cfa3afb8627435744ecdc6d8b58bc72ee0f4c across stable trees
• Review downstream dependents for the keep-ecdsa package and update to 1.8.1