CVE-2024-56715

What it actually does

Failure path after register_netdev() in the ionic driver leaks the previously registered netdev notifier because ionic_lif_unregister() is not invoked.

Why it matters to the business

Long-running systems using the ionic network driver may experience gradual notifier resource exhaustion, leading to degraded network functionality or stability issues over time; low urgency given absent exploitation and low EPSS.

How an attack unfolds

An attacker with local access or the ability to induce register_netdev() failure during ionic device initialization could trigger the leak; no public exploits or named threat actors are associated with this error-handling flaw.

How to fix it

Update the Linux kernel to a version containing commit 87847938f5708b2509b279369c96572254bcf2ba or later; apply vendor backports for affected stable trees.

How to confirm the fix worked

Confirm the ionic driver source contains the ionic_lif_unregister() call on register_netdev() failure; verify kernel version or git commit after patching and test device probe error paths.

Typical attack path

1. Gain ability to load or probe ionic driver
2. Force register_netdev() to fail during LIF initialization
3. Observe accumulation of unregistered netdev notifiers

How to detect it

Inspect kernel logs and dmesg for ionic driver probe sequences that reach register_netdev failure without subsequent unregister calls; correlate with process activity initiating module load or device discovery.

What your security team should do

• Apply the referenced kernel fix to all systems using the ionic driver
• Monitor kernel logs for ionic LIF registration failures during driver load
• Review downstream dependents and schedule updates according to ecosystem prevalence