CVE-2026-80715

Description

In the Linux kernel, the following vulnerability has been resolved: igc: remove napi_synchronize() in igc_down() When an AF_XDP zero-copy application is killed abruptly, the XSK pool is torn down but NAPI keeps polling. igc_clean_rx_irq_zc() then returns the full budget on every poll, so napi_complete_done() never clears NAPI_STATE_SCHED. igc_down() calls napi_synchronize() before napi_disable(), so it spins forever waiting for that bit and the interface never goes down. Drop the napi_synchronize() and let napi_disable() do the job -- it sets NAPI_STATE_DISABLE, which forces the stuck poll to complete. Reorder it ahead of igc_set_queue_napi() so the NAPI mapping is cleared only after polling has stopped, matching the recent igb fix b1e067240379.

References

• https://git.kernel.org/stable/c/3b5aee6fcbf6b58112d40d19c8d31fa3f78ee668
• https://git.kernel.org/stable/c/5ffab5b9589c50e4cfc0cf36ffd76c89422d4019
• https://git.kernel.org/stable/c/605585a8d89aaeb0122e9016fdaa92376897a705
• https://git.kernel.org/stable/c/9a2b637aef4e515c2179774888441d00e8a5ae95
• https://git.kernel.org/stable/c/a0f16c337691813f8d8f014c01fff5a368e08898