{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74510",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74510"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "Bluetooth: mgmt: fix UAF in pair command cancellation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix UAF in pair command cancellation\n\nThe pairing completion and authentication failure callbacks look up the\npending MGMT_OP_PAIR_DEVICE command by walking hdev->mgmt_pending. The\nlookup returned a command that was still linked on the shared pending list,\nwithout keeping mgmt_pending_lock held for the later dereference and\nremoval.\n\nA concurrent MGMT_OP_CANCEL_PAIR_DEVICE request can remove and free the\nsame pending command before the callback uses it. The reverse race is also\npossible when cancel_pair_device() gets a command from pending_find() and a\ncallback removes it before the cancel path dereferences it. This can lead\nto a use-after-free and a second list_del().\n\nMake the pairing lookup helpers transfer ownership of the pending command\nby removing it from hdev->mgmt_pending while holding mgmt_pending_lock.\nThe callbacks and cancel path then complete the command and free it\ndirectly, so racing paths cannot find or free the same command again. Take\na temporary hci_conn reference in cancel_pair_device() because the command\ncompletion drops the reference stored in the pending command.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74510"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/50af4280a587c9971b5388cbc438f1324e626b7b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86ed4dd6548ccf277bc691bc912ca06e76b9d80c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c2a152a897cd1c184b2051484d4f74d803e7f4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c569def320aa8b1fde89227e2ea96606790fd86d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/51be7280980fddc90ebe874a69c2fe8ab02bb46a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is triggered through local AF_BLUETOOTH HCI_CHANNEL_CONTROL management commands (hci_sock_bind/sendmsg -> hci_mgmt_cmd -> pair_device/cancel_pair_device); remote Bluetooth peers cannot issue MGMT_OP_PAIR_DEVICE or MGMT_OP_CANCEL_PAIR_DEVICE over the air.\nAC:L - An attacker controls the race by concurrently issuing MGMT_OP_PAIR_DEVICE and MGMT_OP_CANCEL_PAIR_DEVICE from threads or sockets they own while pairing HCI callbacks fire, and can retry until cancel and completion/auth/SMP paths interleave on the same pending command.\nPR:L - pair_device and cancel_pair_device lack HCI_MGMT_UNTRUSTED and require HCI_SOCK_TRUSTED (CAP_NET_ADMIN at bind); per kernel CNA guidance CAP_NET_ADMIN reachable via unprivileged user namespaces (unshare -Urn) maps to PR:L, consistent with similar Bluetooth mgmt UAF scores.\nUI:N - No victim interaction is required beyond a powered Bluetooth controller; the attacker directly sends the conflicting PAIR_DEVICE and CANCEL_PAIR_DEVICE management commands that create the pending entry and race the unlocked find_pairing/pending_find paths against completion callbacks.\nS:U - Exploitation corrupts kernel Bluetooth MGMT heap objects (mgmt_pending_cmd) within the same host kernel security authority; this is standard local kernel memory corruption, not a VM, IOMMU, or cross-authority boundary escape.\nC:H - Use-after-free of mgmt_pending_cmd when find_pairing or pending_find returns a still-linked command without holding mgmt_pending_lock through later dereference and mgmt_pending_remove, enabling arbitrary kernel memory disclosure via slab reuse of the freed object.\nI:H - Slab UAF and double list_del on mgmt_pending_cmd during concurrent cancel_pair_device and pairing/auth/SMP completion callbacks provide attacker-influenced heap corruption primitives exploitable for arbitrary kernel writes and control-flow hijacking per kernel UAF guidance.\nA:H - Dereferencing or list_del on a freed mgmt_pending_cmd during the cancel versus callback race causes kernel oops or panic; repeated concurrent PAIR_DEVICE and CANCEL_PAIR_DEVICE commands during active pairing can reliably crash or hang the system."
    }
  }
}