{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53253",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53253"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "Bluetooth: bnep: reject short frames before parsing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: reject short frames before parsing\n\nA BNEP peer can send a short BNEP SDU. bnep_rx_frame() reads the\npacket type byte immediately and, for control packets, reads the control\nopcode and setup UUID-size byte before proving that those bytes are\npresent. bnep_rx_control() also dereferences the control opcode without\nrejecting an empty control payload.\n\nUse skb_pull_data() for the fixed fields in bnep_rx_frame() so a NULL\nreturn gates each dereference. Split the control handler so the frame\npath can pass an opcode that has already been pulled, and keep the\nbyte-buffer wrapper for extension control payloads.\n\nFor BNEP_SETUP_CONN_REQ, name the UUID-size byte before pulling the\nsetup payload. struct bnep_setup_conn_req carries destination and source\nservice UUIDs after that byte, each uuid_size bytes, so the parser now\ndocuments that tuple explicitly instead of leaving the pull length as an\nopaque multiplication.\n\nValidation reproduced this kernel report:\nKASAN slab-out-of-bounds in bnep_rx_frame.isra.0+0x130c/0x1790\nThe buggy address belongs to the object at ffff88800c0f7908 which belongs\nto the cache kmalloc-8 of size 8\nThe buggy address is located 0 bytes to the right of allocated 1-byte\nregion [ffff88800c0f7908, ffff88800c0f7909)\nRead of size 1\nCall trace:\n  dump_stack_lvl+0xb3/0x140 (?:?)\n  print_address_description+0x57/0x3a0 (?:?)\n  bnep_rx_frame+0x130c/0x1790 (net/bluetooth/bnep/core.c:306)\n  print_report+0xb9/0x2b0 (?:?)\n  __virt_addr_valid+0x1ba/0x3a0 (?:?)\n  srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n  kasan_addr_to_slab+0x21/0x60 (?:?)\n  kasan_report+0xe0/0x110 (?:?)\n  process_one_work+0xfce/0x17e0 (kernel/workqueue.c:3200)\n  worker_thread+0x65c/0xe40 (?:?)\n  __kthread_parkme+0x184/0x230 (?:?)\n  kthread+0x35e/0x470 (?:?)\n  _raw_spin_unlock_irq+0x28/0x50 (?:?)\n  ret_from_fork+0x586/0x870 (?:?)\n  __switch_to+0x74f/0xdc0 (?:?)\n  ret_from_fork_asm+0x1a/0x30 (?:?)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53253"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0ef2ea86c82b2615902d085cd5a586fe9f58994f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b83afb19293e4de700edae306115f18966dc4f9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/691f14b6a48b637655755134f1e551c7c6fedc2e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d76dec1a37122bc16d83d059c08c0512ea8de909"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c893e17d2809ec9c4b3f1cdd5847cecbc27a311b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be837cd09897e9e6e1958174501d467bdcbcc2bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6770d3a8acdf9151769180cc3710346c4cfbe6f0"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - Bluetooth BNEP traffic is delivered by an adjacent Bluetooth/L2CAP peer over the PAN channel. The vulnerable parser is reached from received Bluetooth packets, not from an Internet-routable network path.\nAC:L - A peer can trigger the bug with a deliberately short BNEP SDU such as a one-byte control frame or truncated setup request. No race, heap grooming, or victim state beyond an established BNEP channel is required to reach the invalid read.\nPR:N - The attacker is the remote Bluetooth BNEP peer sending payload bytes after the channel exists and needs no privileges on the target system. The local CAP_NET_ADMIN check only applies to the trusted userspace component that creates the BNEP session.\nUI:N - Once a BNEP/PAN service or connection is active, the malicious peer can send the malformed SDU without further victim action. No file opening, mount, or interactive operation is needed for the vulnerable receive path.\nS:U - The impact is within the target kernel/Bluetooth networking stack security authority. There is no VM, IOMMU, or separate sandbox boundary crossed.\nC:L - The bug is a fixed-field out-of-bounds read of one-byte BNEP type/opcode/UUID-size fields, with at most limited adjacent heap-byte exposure. It is not an arbitrary kernel memory read primitive.\nI:N - The vulnerable paths perform out-of-bounds reads before validation but do not write past bounds or corrupt attacker-chosen kernel structures. No credible integrity impact follows from the parsed short-frame bug itself.\nA:H - The fix commit reproduces a KASAN slab-out-of-bounds report in bnep_rx_frame from attacker-controlled short frames. Repeated adjacent peer-triggered malformed frames can crash or panic affected/hardened kernels, causing denial of service."
    }
  }
}