CVE-2026-80715

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < ad6e0df267dc96edb7de1fa0a2fb2a70645bff86affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < 605585a8d89aaeb0122e9016fdaa92376897a705affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < a0f16c337691813f8d8f014c01fff5a368e08898affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < f929a6fe5b7ae1e72d2c6d18cd69ab90dcf689d2affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < 3b5aee6fcbf6b58112d40d19c8d31fa3f78ee668affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < 9a2b637aef4e515c2179774888441d00e8a5ae95affected
LinuxLinuxfc9df2a0b520d7d439ecf464794d53e91be74b93 < 5ffab5b9589c50e4cfc0cf36ffd76c89422d4019affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.217 <= 5.15.*unaffected
LinuxLinux6.1.184 <= 6.1.*unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References