{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93799",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93799"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "wifi: iwlwifi: mvm: validate sta_id in BA window status notif",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: validate sta_id in BA window status notif\n\nBA_WINDOW_STATUS_NOTIFICATION_ID extracts a 5-bit sta_id from the\nfirmware notification and uses it to index fw_id_to_mac_id[] without\nbounds checking. Validate sta_id before array access to prevent\nout-of-bounds indexing.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93799"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9938eb95e2ddab4a58d3946a320abcbd60b56a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb08fbbbd5568d33069485ecb0a1657f115a4e9f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e35ae757c6462bfd3437bf58121bb721fe1f790c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6aa77efaea9efea92e3090c35ad348fd759a3cf3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bad 5-bit sta_id is in BA_WINDOW_STATUS_NOTIFICATION (cmd 0x13) DMA'd from the Intel WiFi NIC. iwl_pcie_rx_handle_rb \u2192 iwl_op_mode_rx \u2192 iwl_mvm_rx \u2192 iwl_mvm_rx_common dispatches that notif to iwl_mvm_window_status_notif, which reports received MPDUs in the BA window; that is WiFi radio range, not a routable IP protocol.\nAC:L - iwl_mvm_window_status_notif uses notif->ra_tid's 5-bit sta_id with no race or extra kernel gate beyond VALID and mpdu_rx_count != 0. A nearby peer that sends aggregated 802.11 traffic causes firmware to emit this BA window notif; once sta_id >= num_stations the fw_id_to_mac_id[] OOB is deterministic.\nPR:N - iwl_mvm_window_status_notif is an RX_HANDLER_SYNC handler with no capability, socket, or 802.11 authentication check; iwl_mvm_rx_common invokes it from NAPI as soon as cmd 0x13 arrives. A radio-range attacker needs no host account.\nUI:N - The BA_WINDOW_STATUS_NOTIFICATION is processed automatically in iwl_pcie_napi_poll / iwl_mvm_rx_common on an already-up Intel WiFi interface; the attacker does not need the victim to open a file, mount media, or click through a prompt.\nS:U - The OOB index and the later type-confused ieee80211_mark_rx_ba_filtered_frames() call stay inside iwlwifi/mac80211 kernel memory on the same host; they do not cross a VM, IOMMU, or sandbox boundary.\nC:H - sta_id is 5 bits (0-31) but fw_id_to_mac_id[] has IWL_STATION_COUNT_MAX (16) entries, so sta_id 16-31 reads adjacent fw_id_to_link_sta[] pointers as ieee80211_sta*. ieee80211_mark_rx_ba_filtered_frames() then container_of()s that into sta_info and follows sta->sdata and tid_rx, a type confusion that can disclose kernel memory.\nI:H - The same confused sta_info is used to write tid_agg_rx->head_seq_num and reorder_buf_filtered and to release reorder-buffer frames into ieee80211_rx_handlers(), so the fw_id_to_link_sta versus ieee80211_sta type confusion is a kernel write / RX-injection primitive.\nA:H - Treating an ieee80211_link_sta* as ieee80211_sta* makes container_of() in ieee80211_mark_rx_ba_filtered_frames() compute a bogus sta_info, and the immediate sta->sdata->local dereference in NAPI oopses or panics."
    }
  }
}