wifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band

{
  "id": "1aa4f73453390dab27bd3689eb9318010fa55452c98319e9830d2c5e7b2154ae",
  "url": "https://osv.dev/vulnerability/CVE-2025-38646",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band With a quite rare chance, RX report might be problematic to make SW think a packet is received on 6 GHz band even if the chip does not support 6 GHz band actually. Since SW won't initialize stuffs for unsupported bands, NULL dereference will happen then in the sequence, rtw89_vif_rx_stats_iter() -> rtw89_core_cancel_6ghz_probe_tx(). So, add a check to avoid it. The following is a crash log for this case. BUG: kernel NULL pointer dereference, address: 0000000000000032 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 1907 Comm: irq/131-rtw89_p Tainted: G U 6.6.56-05896-g89f5fb0eb30b #1 (HASH:1400 4) Hardware name: Google Telith/Telith, BIOS Google_Telith.15217.747.0 11/12/2024 RIP: 0010:rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core] Code: 4c 89 7d c8 48 89 55 c0 49 8d 44 24 02 48 89 45 b8 45 31 ff eb 11 41 c6 45 3a 01 41 b7 01 4d 8b 6d 00 4d 39 f5 74 42 8b 43 10 <41> 33 45 32 0f b7 4b 14 66 41 33 4d 36 0f b7 c9 09 c1 74 d8 4d 85 RSP: 0018:ffff9f3080138ca0 EFLAGS: 00010246 RAX: 00000000b8bf5770 RBX: ffff91b5e8c639c0 RCX: 0000000000000011 RDX: ffff91b582de1be8 RSI: 0000000000000000 RDI: ffff91b5e8c639e6 RBP: ffff9f3080138d00 R08: 0000000000000000 R09: 0000000000000000 R10: ffff91b59de70000 R11: ffffffffc069be50 R12: ffff91b5e8c639e",
    "evidence": "osv:CVE-2025-38646",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.102",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.10",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38646",
      "aliases": [
        "CVE-2025-38646"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0"
                },
                {
                  "fixed": "892b29eab44b1803d2cad8e50f1bc2144ef478cb"
                },
                {
                  "fixed": "77a7a48f87d673a68664bebf044214821decbfda"
                },
                {
                  "fixed": "f3527ac15a00916e68ecb495b74dbe6a6c62a06f"
                },
                {
                  "fixed": "4b525630729082f026e7030eafccf89e3add7eae"
                },
                {
                  "fixed": "7e04f01bb94fe61c73cc59f0495c3b6c16a83231"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38646.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.102"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.10"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.16.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38646.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.314863808Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b525630729082f026e7030eafccf89e3add7eae",
        "https://git.kernel.org/stable/c/77a7a48f87d673a68664bebf044214821decbfda",
        "https://git.kernel.org/stable/c/7e04f01bb94fe61c73cc59f0495c3b6c16a83231",
        "https://git.kernel.org/stable/c/892b29eab44b1803d2cad8e50f1bc2144ef478cb",
        "https://git.kernel.org/stable/c/f3527ac15a00916e68ecb495b74dbe6a6c62a06f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38646.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38646",
        "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/2025/38xxx/CVE-2025-38646.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38646",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491756,
  "published_at": "2025-08-22T16:00:51.397+00:00"
}