{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64445",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64445"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth()\n\nOnAuth() has two bugs in the shared-key authentication path.\n\nWhen the Privacy bit is set, rtw_wep_decrypt() is called without\nverifying that the frame is long enough to contain a valid WEP IV and\nICV.  Inside rtw_wep_decrypt(), length is computed as:\n\n    length = len - WLAN_HDR_A3_LEN - iv_len\n\nand then passed as (length - 4) to crc32_le().  If len is less than\nWLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative\nand, after the implicit cast to size_t, causes crc32_le() to read far\nbeyond the frame buffer.  Add a minimum length check before accessing\nthe IV field and calling the decryption path.\n\nWhen processing a seq=3 response, rtw_get_ie() stores the Challenge\nText IE length in ie_len, but the subsequent memcmp() always reads 128\nbytes regardless of ie_len.  IEEE 802.11 mandates a challenge text of\nexactly 128 bytes; reject any IE whose length field differs, matching\nthe check already applied to OnAuthClient().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64445"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/665e1ecb68b4e8419604e70a33f02d1c8b0222c6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9000c93078e5c0a5a651b077c0ec92a4bc7d580"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e44a7665f3abd320a80d9c64ee4a93317041b8b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64ec4192d9c10e96922245d4a6747304cc76b19d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d90b9f39f375c9826ef145605dfe97765d0ecb91"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a1fc19d61f661d47204f095b593de507884849f7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - A nearby attacker can inject crafted 802.11 authentication management frames over the wireless channel to an RTL8723BS interface operating in AP mode.\nAC:L - A single attacker-controlled protected authentication frame can trigger the underflow without knowing a WEP key, winning a race, or satisfying conditions outside the attacker's control.\nPR:N - The vulnerable decryption executes before authentication, association, MAC ACL enforcement, and authentication-algorithm validation, so no credentials or privileges are required.\nUI:N - Once the affected interface is operating normally in AP mode, exploitation requires no action by a victim user.\nS:U - The vulnerable driver and the affected kernel resources belong to the same operating-system security authority; this is not a guest-host or other scope-boundary escape.\nC:H - The CRC underflow supplies a near-SIZE_MAX length to crc32_le(), producing a massive kernel out-of-bounds read, while the short-IE comparison can read up to 127 bytes beyond the Challenge Text IE.\nI:H - For protected frames shorter than 28 bytes, the negative signed length is converted to an approximately 4-GiB unsigned length for the in-place arc4_crypt(), causing extensive out-of-bounds writes capable of corrupting adjacent kernel heap state.\nA:H - The enormous ARC4 operation or CRC read will cross the receive-buffer allocation and can cause an oops, panic, hang, or severe heap corruption; unauthenticated attackers can trigger this repeatedly."
    }
  }
}