CVE-2026-98488

What it actually does

The atl1e driver enters an infinite loop when hardware reports an out-of-range hw_next_to_clean value (0xffff) during PCIe/MAC reset, preventing the loop from ever terminating and causing a soft lockup.

Why it matters to the business

Systems using affected Linux kernel network drivers may experience sudden freezes or unresponsiveness, leading to downtime and service disruption; low exploit likelihood and recent publication reduce immediate widespread risk.

How an attack unfolds

An attacker with the ability to induce PCIe link or MAC resets (via power events, driver unload, or hardware faults) can trigger the out-of-range hardware index, causing the driver loop to spin indefinitely and hang the CPU core.

How to fix it

Apply the upstream kernel commit that treats the out-of-range value as no new work to clean; update to a kernel containing the fix for the atl1e driver (and the related atl1c series).

How to confirm the fix worked

Verify the presence of the fix by inspecting the atl1e driver source for the added out-of-range check; confirm no soft lockup messages appear under repeated reset conditions after patching.

Typical attack path

1. Gain local or adjacent access sufficient to trigger network device reset conditions
2. Force or wait for PCIe link/MAC reset while the atl1e receive path is active
3. Hardware reports 0xffff for hw_next_to_clean
4. Driver enters unbounded loop resulting in soft lockup

How to detect it

Search kernel logs and dmesg for repeated soft lockup warnings or atl1e driver activity around reset events; correlate with hardware reset timestamps.

• soft lockup
• atl1e
• hw_next_to_clean
• out-of-range

What your security team should do

• Prioritize kernel updates on systems using atl1e hardware within normal patch cycles given low EPSS
• Monitor dmesg and kernel logs for soft lockup indicators on atl1e interfaces
• Test the fix in staging environments that can reproduce reset scenarios