{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68326",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68326"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "wifi: mwifiex: bound uAP association event IEs to the event buffer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: bound uAP association event IEs to the event buffer\n\nmwifiex_process_uap_event() handles EVENT_UAP_STA_ASSOC by exposing the\n(re)association request IEs that the firmware copies into the event:\n\n\tsinfo->assoc_req_ies = &event->data[len];\n\tlen = (u8 *)sinfo->assoc_req_ies - (u8 *)&event->frame_control;\n\tsinfo->assoc_req_ies_len = le16_to_cpu(event->len) - (u16)len;\n\nevent->len is supplied by the device firmware and is never validated,\nand the subtraction is unchecked.  assoc_req_ies points into\nadapter->event_body[MAX_EVENT_SIZE], a fixed-size array embedded in the\nkmalloc()'d struct mwifiex_adapter.\n\nOn the ap_11n_enabled path mwifiex_set_sta_ht_cap() walks these IEs with\ncfg80211_find_ie(), whose for_each_element() loop dereferences each\nelement header.  A firmware-reported event->len larger than the bytes\nactually received makes assoc_req_ies_len describe IEs that extend past\nevent_body, so the walk reads out of the adapter slab object, a\nslab-out-of-bounds read (KASAN: slab-out-of-bounds in cfg80211_find_ie).\nAn event->len smaller than the header instead makes the int subtraction\nnegative, which wraps to a huge size_t when stored in assoc_req_ies_len.\nThe same length is handed to cfg80211_new_sta(), so a more modest\nover-claim can also copy stale event_body bytes into the\nNL80211_CMD_NEW_STATION notification.\n\nA malicious or malfunctioning mwifiex device (USB/SDIO/PCIe) can deliver\nsuch an event while the interface is in AP/uAP mode.\n\nValidate event->len before use: reject a length that underflows the\nheader or that would place the IEs outside the event_body[] buffer the\nevent was copied into.  event->len here is struct mwifiex_assoc_event.len,\na payload field internal to this event, not the transport frame length,\nso it is validated in this handler rather than at the generic\nMWIFIEX_TYPE_EVENT receive path, which only sees the event cause and the\ntransport frame length.  The bound is against event_body[MAX_EVENT_SIZE]\nrather than the actually-received length because the transports store the\nevent differently (USB and SDIO leave the 4-byte event header in\nevent_skb, PCIe strips it via skb_pull), whereas event_body is the single\nfixed buffer all of them copy the event into.  This is the event-path\nanalogue of the receive-path bounds checks added in commit 119585281617\n(\"wifi: mwifiex: Fix OOB and integer underflow when rx packets\").",
  "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-2026-68326"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a616616b938f7922a93e79bef16b4643c57c0922"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7e93d3e8c240bdb70c41e79d169d74dfb442843"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3f47d7c75ddad1a14621a309286f9fae3cba191"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ad26c75ae25749313248f06510ebe43b5bf4adcc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6766d7ea43edf5de9d5a572bc58b631d09efe4b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0858bfc7d3cab411a447b88e3ef970e575032c9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The event payload is the firmware's rendering of an over-the-air (re)association request received by the mwifiex uAP interface, with event->len being the TLV length covering that frame, so the triggering input comes from a station within 802.11 radio range. This matches the Adjacent treatment used for other frame/event-driven mwifiex defects (CVE-2024-46755, CVE-2023-53226).\nAC:L - No race or attacker-uncontrollable state is involved: the attacker simply sends a crafted/oversized (re)association request to the AP, and the handler parses the resulting EVENT_UAP_STA_ASSOC unconditionally. The only precondition, an mwifiex interface in AP/uAP mode with ap_11n_enabled, is the normal steady state for tethering, Chromebook SoftAP and embedded AP deployments.\nPR:N - EVENT_UAP_STA_ASSOC is generated at association time, before the WPA/EAPOL handshake, so the attacker needs no credentials on or accepted association with the target host. No host user account or capability is involved anywhere on the path.\nUI:N - The event is consumed autonomously by mwifiex_process_uap_event() in the driver's main work handler as soon as the firmware delivers it; no local user or administrator action is required beyond the AP already running.\nS:U - The out-of-bounds read, the underflowed length and the resulting corruption are all confined to the host kernel's own security authority within the mwifiex/cfg80211 code; no hypervisor, IOMMU or sandbox boundary is crossed.\nC:H - An over-claimed event->len makes assoc_req_ies_len describe memory past adapter->event_body[MAX_EVENT_SIZE], producing a slab-out-of-bounds read in cfg80211_find_ie() and, worse, causing nla_put() to copy up to tens of kilobytes of adjacent kernel slab memory into the NL80211_CMD_NEW_STATION notification delivered to userspace \u2014 an unbounded kernel heap disclosure, not a few stray bytes.\nI:H - An event->len below the header makes the int subtraction negative and wrap in size_t; that value reaches nla_put(), where nla_total_size() of the negative length evaluates to 0 and passes the tailroom check, so __nla_put()'s memcpy() runs with the negative length widened to a huge size_t \u2014 an unbounded out-of-bounds write past the netlink skb. Driver 11n/AMSDU state is also set from out-of-bounds data.\nA:H - The commit documents a reproducible KASAN slab-out-of-bounds in cfg80211_find_ie, and the underflow path drives a memcpy of a near-2^64 length that guarantees an immediate kernel panic. The condition can be re-triggered at will by repeating the association attempt."
    }
  }
}