GHSA-7PHJ-65QV-78J8

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80715"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:57Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nigc: remove napi_synchronize() in igc_down()\n\nWhen an AF_XDP zero-copy application is killed abruptly, the XSK pool is\ntorn down but NAPI keeps polling. igc_clean_rx_irq_zc() then returns the\nfull budget on every poll, so napi_complete_done() never clears\nNAPI_STATE_SCHED.\n\nigc_down() calls napi_synchronize() before napi_disable(), so it spins\nforever waiting for that bit and the interface never goes down. Drop the\nnapi_synchronize() and let napi_disable() do the job -- it sets\nNAPI_STATE_DISABLE, which forces the stuck poll to complete. Reorder it\nahead of igc_set_queue_napi() so the NAPI mapping is cleared only after\npolling has stopped, matching the recent igb fix b1e067240379.",
  "id": "GHSA-7phj-65qv-78j8",
  "modified": "2026-08-28T09:31:50Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80715"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b5aee6fcbf6b58112d40d19c8d31fa3f78ee668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ffab5b9589c50e4cfc0cf36ffd76c89422d4019"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/605585a8d89aaeb0122e9016fdaa92376897a705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a2b637aef4e515c2179774888441d00e8a5ae95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0f16c337691813f8d8f014c01fff5a368e08898"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad6e0df267dc96edb7de1fa0a2fb2a70645bff86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f929a6fe5b7ae1e72d2c6d18cd69ab90dcf689d2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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