wifi: brcmfmac: Check the count value of channel spec to prevent out-of-bounds reads

{
  "id": "e5bee6a422a7972a2ef17504db344012c08dc57117b964f3dc1578ba704ffcf6",
  "url": "https://osv.dev/vulnerability/CVE-2022-49740",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: brcmfmac: Check the count value of channel spec to prevent out-of-bounds reads",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Check the count value of channel spec to prevent out-of-bounds reads This patch fixes slab-out-of-bounds reads in brcmfmac that occur in brcmf_construct_chaninfo() and brcmf_enable_bw40_2g() when the count value of channel specifications provided by the device is greater than the length of 'list->element[]', decided by the size of the 'list' allocated with kzalloc(). The patch adds checks that make the functions free the buffer and return -EINVAL if that is the case. Note that the negative return is handled by the caller, brcmf_setup_wiphybands() or brcmf_cfg80211_attach(). Found by a modified version of syzkaller. Crash Report from brcmf_construct_chaninfo(): ================================================================== BUG: KASAN: slab-out-of-bounds in brcmf_setup_wiphybands+0x1238/0x1430 Read of size 4 at addr ffff888115f24600 by task kworker/0:2/1896 CPU: 0 PID: 1896 Comm: kworker/0:2 Tainted: G W O 5.14.0+ #132 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0x57/0x7d print_address_description.constprop.0.cold+0x93/0x334 kasan_report.cold+0x83/0xdf brcmf_setup_wiphybands+0x1238/0x1430 brcmf_cfg80211_attach+0x2118/0x3fd0 brcmf_attach+0x389/0xd40 brcmf_usb_probe+0x12de/0x1690 usb_probe_interface+0x25f/0x710 really_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0",
    "evidence": "osv:CVE-2022-49740",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.232",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.168",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49740",
      "aliases": [
        "CVE-2022-49740"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "d48200ba45dd2edfe6286abfc783a81a4a492e98"
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                  "fixed": "9cf5e99c1ae1a85286a76c9a970202750538394c"
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                  "fixed": "b2e412879595821ff1b5545cbed5f108fba7f5b6"
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                  "fixed": "e4991910f15013db72f6ec0db7038ea67a57052e"
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                  "fixed": "f06de1bb6d61f0c18b0213bbc6298960037f9d42"
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                  "fixed": "4920ab131b2dbae7464b72bdcac465d070254209"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49740.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.10.0"
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                {
                  "fixed": "5.4.232"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.5.0"
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              "events": [
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                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.93"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
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                  "fixed": "6.1.11"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49740.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.980851486Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4920ab131b2dbae7464b72bdcac465d070254209",
        "https://git.kernel.org/stable/c/9cf5e99c1ae1a85286a76c9a970202750538394c",
        "https://git.kernel.org/stable/c/b2e412879595821ff1b5545cbed5f108fba7f5b6",
        "https://git.kernel.org/stable/c/e4991910f15013db72f6ec0db7038ea67a57052e",
        "https://git.kernel.org/stable/c/f06de1bb6d61f0c18b0213bbc6298960037f9d42",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49740.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49740",
        "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/2022/49xxx/CVE-2022-49740.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49740",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517243,
  "published_at": "2025-03-27T16:42:52.222+00:00"
}