wifi: brcmfmac: Fix potential stack-out-of-bounds in brcmf_c_preinit_dcmds()

{
  "id": "b82cf74f6337541a8f8b9c9f6e694da1149bb84b367fc348104fa132ca79ae28",
  "url": "https://osv.dev/vulnerability/CVE-2022-50258",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: brcmfmac: Fix potential stack-out-of-bounds in brcmf_c_preinit_dcmds()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential stack-out-of-bounds in brcmf_c_preinit_dcmds() This patch fixes a stack-out-of-bounds read in brcmfmac that occurs when 'buf' that is not null-terminated is passed as an argument of strsep() in brcmf_c_preinit_dcmds(). This buffer is filled with a firmware version string by memcpy() in brcmf_fil_iovar_data_get(). The patch ensures buf is null-terminated. Found by a modified version of syzkaller. [ 47.569679][ T1897] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43236b for chip BCM43236/3 [ 47.582839][ T1897] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available [ 47.601565][ T1897] ================================================================== [ 47.602574][ T1897] BUG: KASAN: stack-out-of-bounds in strsep+0x1b2/0x1f0 [ 47.603447][ T1897] Read of size 1 at addr ffffc90001f6f000 by task kworker/0:2/1897 [ 47.604336][ T1897] [ 47.604621][ T1897] CPU: 0 PID: 1897 Comm: kworker/0:2 Tainted: G O 5.14.0+ #131 [ 47.605617][ T1897] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 [ 47.606907][ T1897] Workqueue: usb_hub_wq hub_event [ 47.607453][ T1897] Call Trace: [ 47.607801][ T1897] dump_stack_lvl+0x8e/0xd1 [ 47.608295][ T1897] print_address_description.constprop.0.cold+0xf/0x334 [ 47.609009][ T1897] ? strsep+0x1b2/0x1f0 [ 47.609434][ T1897] ? strsep+0x1",
    "evidence": "osv:CVE-2022-50258",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50258",
      "aliases": [
        "CVE-2022-50258"
      ],
      "affected": [
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          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:24.541255320Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a06cadcc2a0044e4a117cc0e61436fc3a0dad69",
        "https://git.kernel.org/stable/c/17dbe90e13f52848c460d253f15b765038ec6dc0",
        "https://git.kernel.org/stable/c/3a3a5e3f94068cd562d62a57da6983c8cd07d53c",
        "https://git.kernel.org/stable/c/881f50d76c3892262730ddf5c894eb00310e736c",
        "https://git.kernel.org/stable/c/89243a7b0ea19606ba1c2873c9d569026ccb344f",
        "https://git.kernel.org/stable/c/ba166e0ebdde3dfa833f0a3edaf2b2934d4a87f7",
        "https://git.kernel.org/stable/c/d481fd6064bf215d7c5068e15aa390c3b16c9cd0",
        "https://git.kernel.org/stable/c/d6ef66194bb4a6c18f5b9649bf62597909b040e4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50258.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50258",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50258.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50258",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490805,
  "published_at": "2025-09-15T14:02:43.992+00:00"
}