Linux kernel igc driver NAPI synchronization bug in XDP zero-copy
CVE-2026-80715 Published on August 28, 2026
igc: remove napi_synchronize() in igc_down()
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.
Products Associated with CVE-2026-80715
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Affected Versions
Linux:- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below ad6e0df267dc96edb7de1fa0a2fb2a70645bff86 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below 605585a8d89aaeb0122e9016fdaa92376897a705 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below a0f16c337691813f8d8f014c01fff5a368e08898 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below f929a6fe5b7ae1e72d2c6d18cd69ab90dcf689d2 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below 3b5aee6fcbf6b58112d40d19c8d31fa3f78ee668 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below 9a2b637aef4e515c2179774888441d00e8a5ae95 is affected.
- Version fc9df2a0b520d7d439ecf464794d53e91be74b93 and below 5ffab5b9589c50e4cfc0cf36ffd76c89422d4019 is affected.
- Version 5.14 is affected.
- Before 5.14 is unaffected.
- Version 5.15.217, <= 5.15.* is unaffected.
- Version 6.1.184, <= 6.1.* is unaffected.
- Version 6.6.153, <= 6.6.* is unaffected.
- Version 6.12.105, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.