wifi: rtlwifi: Fix global-out-of-bounds bug in _rtl8812ae_phy_set_txpower_limit()

{
  "id": "acebdab952d8cfcf46d2e245aac90e00b8a66767d9d571ed05663266926d9658",
  "url": "https://osv.dev/vulnerability/CVE-2022-50279",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: rtlwifi: Fix global-out-of-bounds bug in _rtl8812ae_phy_set_txpower_limit()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: Fix global-out-of-bounds bug in _rtl8812ae_phy_set_txpower_limit() There is a global-out-of-bounds reported by KASAN: BUG: KASAN: global-out-of-bounds in _rtl8812ae_eq_n_byte.part.0+0x3d/0x84 [rtl8821ae] Read of size 1 at addr ffffffffa0773c43 by task NetworkManager/411 CPU: 6 PID: 411 Comm: NetworkManager Tainted: G D 6.1.0-rc8+ #144 e15588508517267d37 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), Call Trace: ... kasan_report+0xbb/0x1c0 _rtl8812ae_eq_n_byte.part.0+0x3d/0x84 [rtl8821ae] rtl8821ae_phy_bb_config.cold+0x346/0x641 [rtl8821ae] rtl8821ae_hw_init+0x1f5e/0x79b0 [rtl8821ae] ... The root cause of the problem is that the comparison order of \"prate_section\" in _rtl8812ae_phy_set_txpower_limit() is wrong. The _rtl8812ae_eq_n_byte() is used to compare the first n bytes of the two strings from tail to head, which causes the problem. In the _rtl8812ae_phy_set_txpower_limit(), it was originally intended to meet this requirement by carefully designing the comparison order. For example, \"pregulation\" and \"pbandwidth\" are compared in order of length from small to large, first is 3 and last is 4. However, the comparison order of \"prate_section\" dose not obey such order requirement, therefore when \"prate_section\" is \"HT\", when comparing from tail to head, it will lead to access out of bounds in _rtl8812ae_eq_n_byte(). As mentioned above, the _rtl8812ae_eq_n_byte() has the same function as strc",
    "evidence": "osv:CVE-2022-50279",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.276",
            "evidence": "/affected/1/ranges"
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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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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50279",
      "aliases": [
        "CVE-2022-50279"
      ],
      "affected": [
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50279.json"
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              "type": "ECOSYSTEM",
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            "ecosystem": "Linux"
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      "modified": "2026-10-28T02:30:43.006530836Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/057b52461dc005ecd85a3e4998913b1492ec0f72",
        "https://git.kernel.org/stable/c/0c962dcd6bf64b78eaffc09e497a2beb4e48bc32",
        "https://git.kernel.org/stable/c/117dbeda22ec5ea0918254d03b540ef8b8a64d53",
        "https://git.kernel.org/stable/c/1e950b9a841bc96e98ee25680d5c7aa305120be1",
        "https://git.kernel.org/stable/c/28ea268d95e57cdf6394a058f0d854206d478772",
        "https://git.kernel.org/stable/c/f1fe40120de6ad4ffa8299fde035a5feba10d4fb",
        "https://git.kernel.org/stable/c/fc3442247716fc426bbcf62ed65e086e48a6d44f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50279.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50279",
        "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-2022-50279.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50279",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510723,
  "published_at": "2025-09-15T14:21:16.051+00:00"
}