{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93790",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93790"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif\n\nmvmsta->tid_data was indexed by the TFD loop counter 'i' instead of\nthe actual TID value 'tid'. This writes lq_color into a random tid_data\nslot unrelated to the BA entry.\nSince multi-TID blockack is not really in use, 'i' was always 0 and no\nharm was done.\nAdd a out-of-bound check before accessing the array.",
  "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-2026-93790"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/35f991d685feafd27255bd33272512c434e52527"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c48b741277b01b2c3b4ecccedc72fc575b71dc04"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8ac5e91b1296f65c3d119fac3fa917ff458f811"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/94d3982806c7f194b23484befde12934dda23064"
    }
  ],
  "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 - iwl_mvm_rx_ba_notif is the BA_NOTIF (0xc5) handler reached from iwl_pcie_rx_handle_rb \u2192 iwl_mvm_rx_mq \u2192 iwl_mvm_rx_common. The OOB index is tfd_cnt from iwl_compressed_ba_notif, firmware\u2019s report of a received 802.11 Block Ack, so the triggering bytes arrive over WiFi radio range, not a routable IP protocol.\nAC:L - On the new-TX-API path, iwl_mvm_rx_ba_notif writes mvmsta->tid_data[i].lq_color for i in [0, tfd_cnt) with no cap against ARRAY_SIZE(tid_data) (9). tfd_cnt is a firmware __le16 gated only by struct_size(..., tfd, tfd_cnt) versus pkt_len; a single BA_NOTIF with tfd_cnt>=10 is a deterministic sync-RX write, not a race.\nPR:N - BA_NOTIF is RX_HANDLER_SYNC with no capable() or socket-cred check. iwl_mvm_sta_from_staid_rcu only needs sta_id to name a live fw_id_to_mac_id station (associated AP or client); the RF peer needs no host uid or capability.\nUI:N - iwl_mvm_rx_ba_notif runs from NAPI when firmware posts BA_NOTIF; the victim does not mount, open a file, or otherwise act to process the compressed BA once the WiFi interface already has a station.\nS:U - tid_data sits in iwl_mvm_sta inside ieee80211_sta->drv_priv; the overflow corrupts that host kernel object and adjacent heap, and does not cross a VM, IOMMU, or sandbox authority.\nC:H - Each loop stores lq_color (TX_RES_RATE_TABLE_COL_GET of tlc_rate_info) at tid_data[i]; with tfd_cnt>=10 those 40-byte-strided writes leave the 9-element array, smash vif/ptk_pn, and continue into neighboring kernel objects, a memory-corruption disclosure primitive.\nI:H - The same store is a kernel OOB write: at i=9 the lq_color write lands on iwl_mvm_sta->vif, and larger tfd_cnt walks ptk_pn[] and off the station object, enabling pointer corruption and control-flow hijack rather than a bounded LQ-color update.\nA:H - Corrupting vif or later heap pointers in iwl_mvm_sta makes the following iwl_mvm_tx_reclaim() (which reads mvmsta->vif and tid_data[tid]) and later station use oops; an unmapped-pointer dereference in RX softirq is a host kernel crash."
    }
  }
}