{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43172",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43172"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "wifi: iwlwifi: fix 22000 series SMEM parsing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: fix 22000 series SMEM parsing\n\nIf the firmware were to report three LMACs (which doesn't\nexist in hardware) then using \"fwrt->smem_cfg.lmac[2]\" is\nan overrun of the array. Reject such and use IWL_FW_CHECK\ninstead of WARN_ON in this function.",
  "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-2026-43172"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1d49a42717bdc8de77eabeb5b7d3e88d141ffea9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b4b1510aaaf5b9fb57327ecffc20c055f61f205"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/58192b9ce09b0f0f86e2036683bd542130b91a98"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The vulnerable path is in the Wi-Fi device/firmware control path during iwlwifi start/restart when the host parses a firmware-supplied SHARED_MEM_CFG_CMD response, not a routed IP service. For the affected Wi-Fi subsystem, the highest reasonable external exposure is an adjacent wireless attacker able to drive malicious firmware/device behavior.\nAC:L - There is no race or complex state requirement once a malformed response is supplied. Setting lmac_num to 3 deterministically reaches the out-of-bounds write in the 22000-series parser.\nPR:N - The malformed firmware response is parsed by the kernel driver without OS credential checks and before any Wi-Fi peer authentication boundary matters. In the adjacent attacker model, no local account or kernel privilege is required.\nUI:N - The parser runs automatically during normal Wi-Fi device start or restart. Exploitation does not require a victim to open a file, mount anything, or perform a special action.\nS:U - The corruption affects host kernel iwlwifi driver state within the same kernel security authority. It does not inherently cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is an attacker-controlled out-of-bounds write past fwrt->smem_cfg.lmac into adjacent iwl_fw_runtime state. Kernel memory corruption is reasonably leverageable for high confidentiality impact.\nI:H - Firmware-controlled 32-bit values are written beyond the two-element LMAC array into adjacent kernel driver fields. This is an out-of-bounds write with potential for arbitrary kernel state modification or control-flow influence.\nA:H - Even without full exploitation, corrupting adjacent iwlwifi runtime/debug/workqueue state can crash or destabilize the kernel. Kernel oops, panic, or persistent Wi-Fi driver failure constitutes high availability impact."
    }
  }
}