{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cf2719a21fdb9d4c8e9c834d279163609bef575d"
            },
            {
              "fixed": "149cfb42ad69c7964fd9f2c43831da9152007129"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "160fbcf3bfb93c3c086427f9f4c8bc70f217e9be"
            },
            {
              "fixed": "7b2d4c04816cdc887f472caaf7fc966cfc107e40"
            },
            {
              "fixed": "1e1e509b6fd2a42421745bbcd98bd16daad20904"
            },
            {
              "fixed": "2c1143564c71e7497b42d8360a8379ccbb011d3c"
            },
            {
              "fixed": "3485c7236c59c8c34a41af1c4b52982437554e79"
            },
            {
              "fixed": "f743eab6486965f276c7e3f1700895f014fdc6db"
            },
            {
              "fixed": "daf23014e5d975e72ea9c02b5160d3fcf070ea47"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "9b67438e315b925a699f0178f4a48baf3d2d6ef4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.78"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.0.8"
            },
            {
              "fixed": "6.1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.88"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.30"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46186.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: virtio_bt: validate rx pkt_type header length\n\nvirtbt_rx_handle() reads the leading pkt_type byte from the RX skb\nand forwards the remainder to hci_recv_frame() for every\nevent/ACL/SCO/ISO type, without checking that the remaining payload\nis at least the fixed HCI header for that type.\n\nAfter the preceding patch bounds the backend-supplied used.len to\n[1, VIRTBT_RX_BUF_SIZE], a one-byte completion still reaches\nhci_recv_frame() with skb-\u003elen already pulled to 0. If the byte\nhappened to be HCI_ACLDATA_PKT, the ACL-vs-ISO classification\nfast-path in hci_dev_classify_pkt_type() dereferences\nhci_acl_hdr(skb)-\u003ehandle whenever the HCI device has an active\nCIS_LINK, BIS_LINK, or PA_LINK connection, reading two bytes of\nuninitialized RX-buffer data. The same hazard exists for every\npacket type the driver accepts because none of the switch cases in\nvirtbt_rx_handle() check skb-\u003elen against the per-type minimum HCI\nheader size before handing the frame to the core.\n\nAfter stripping pkt_type, require skb-\u003elen to cover the fixed\nheader size for the selected type (event 2, ACL 4, SCO 3, ISO 4)\nbefore calling hci_recv_frame(); drop ratelimited otherwise.\nUnknown pkt_type values still take the original kfree_skb() default\npath.\n\nUse bt_dev_err_ratelimited() because both the length and pkt_type\nvalues come from an untrusted backend that can otherwise flood the\nkernel log.",
  "id": "CVE-2026-46186",
  "modified": "2026-07-08T05:37:26.788744988Z",
  "published": "2026-05-28T09:36:40.349Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/149cfb42ad69c7964fd9f2c43831da9152007129"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e1e509b6fd2a42421745bbcd98bd16daad20904"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c1143564c71e7497b42d8360a8379ccbb011d3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3485c7236c59c8c34a41af1c4b52982437554e79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b2d4c04816cdc887f472caaf7fc966cfc107e40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/daf23014e5d975e72ea9c02b5160d3fcf070ea47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f743eab6486965f276c7e3f1700895f014fdc6db"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46186.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46186"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "Bluetooth: virtio_bt: validate rx pkt_type header length"
}