CVE-2026-80715

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References