{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64557",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64557"
  ],
  "published": "2026-07-29T08:01:46Z",
  "summary": "Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()\n\nl2cap_sock_new_connection_cb() returned l2cap_pi(sk)->chan after\nrelease_sock(parent). Once the parent lock is dropped the newly\nenqueued child socket sk is reachable via the accept queue, so another\ntask can accept and free it before the callback dereferences sk,\nresulting in a use-after-free.\n\nRework the ->new_connection() op so the core, rather than the callback,\nowns the child channel's lifetime. The op now receives a pre-allocated\nnew_chan and returns an errno instead of allocating and returning a\nchannel. l2cap_new_connection() allocates the child channel and links\nit into the conn list via __l2cap_chan_add() before invoking the\ncallback, so the conn-list reference keeps the channel alive once\nrelease_sock(parent) exposes the socket to other tasks.\n\nChannel configuration that was duplicated in l2cap_sock_init() and the\nvarious new_connection callbacks is consolidated into\nl2cap_chan_set_defaults(), which now inherits from the parent channel\nwhen one is supplied.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64557"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b39298044e5534612511a2ff5de03ba5f6e7a820"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8c37e4338c801ebb8cee52436c01c41e009f6e87"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84e718b6a814edc84159361f9f454a4e92ae91ae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36da806f7fbaee56ad9e81859deec203f9728700"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/733e76e74e406c1d1ddc7369420dd8a47f48bb8a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6fef032af0092ed5ccb767239a9ac1bc38c08a40"
    }
  ],
  "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 - The vulnerable callback is reached only from L2CAP signalling handlers (`l2cap_connect`, `l2cap_le_connect_req`, `l2cap_ecred_conn_req`, `l2cap_connect_cfm`) processing connection requests received from a remote Bluetooth peer. Bluetooth radio range constitutes an adjacent network.\nAC:L - The attacker drives one side of the race by sending unlimited L2CAP connect requests and can induce the other side, since the local daemon accepts (immediately, for DEFER_SETUP listeners) and closes rejected/unauthorized children; on SMP the accepting task runs truly concurrently while the callback is still inside `release_sock()`, so the window is hit reliably with repeated attempts.\nPR:N - `l2cap_connect()` bypasses the link-mode and encryption-key-size checks entirely for PSM 0x0001 (SDP), where bluetoothd holds a listening L2CAP socket, so an unpaired and unauthenticated remote device can reach `l2cap_sock_new_connection_cb()`; LE CoC and low-security BR/EDR listeners are likewise reachable without credentials.\nUI:N - Incoming L2CAP connection requests are processed automatically by the kernel and accepted by the always-running Bluetooth daemon with no victim action, no pairing prompt, and no user confirmation.\nS:U - The corrupted `l2cap_chan`/`sock` objects and the resulting memory corruption are confined to the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free: the freed `l2cap_chan` slab object can be reallocated with attacker-groomed data and its fields are subsequently read back and transmitted to the attacker via the connect response and `l2cap_build_conf_req()`, and `__l2cap_chan_add()` deposits kernel list pointers into the reallocated object, giving a kernel-memory disclosure primitive.\nI:H - After the free, `l2cap_connect()`/`l2cap_le_connect_req()` write attacker-supplied PSM, SCID, MTU/MPS and BD_ADDR values plus list pointers into the freed object, and `__set_chan_timer()` arms delayed work whose function pointers live in that freed memory \u2014 a controlled write primitive suitable for heap spraying and control-flow hijack.\nA:H - Even without successful exploitation, the use-after-free reads and writes into freed slab memory and links a dead object into the conn list, reliably producing kernel oops/panic and corrupted list traversal on subsequent L2CAP operations."
    }
  }
}