{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a33bc07b4730b6cd5681ac77d18ae0de3e739690",
              "status": "affected",
              "version": "e6720779ae612a14ac4ba7fe4fd5b27d900d932c",
              "versionType": "git"
            },
            {
              "lessThan": "8fe627192fa5da7157f9a48608f13c04b6373e43",
              "status": "affected",
              "version": "e6720779ae612a14ac4ba7fe4fd5b27d900d932c",
              "versionType": "git"
            },
            {
              "lessThan": "abd93c85c8667add738ee82aeab95dd9fc8265a2",
              "status": "affected",
              "version": "e6720779ae612a14ac4ba7fe4fd5b27d900d932c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: give the socket its own sco_conn reference\n\nsco_conn_del() drops a reference it does not own. It takes one transient\nreference via sco_conn_hold_unless_zero() and releases it with the\nsco_conn_put() that follows sco_sock_hold(); the additional put in the\n!sk branch releases a second one:\n\n    conn = sco_conn_hold_unless_zero(conn);\n    ...\n    sk = sco_sock_hold(conn);\n    sco_conn_unlock(conn);\n    sco_conn_put(conn);\n\n    if (!sk) {\n            sco_conn_put(conn);\n            return;\n    }\n\nWhen close() races the controller\u0027s Disconnection Complete, sco_chan_del()\nclears conn-\u003esk and drops the socket\u0027s reference while sco_conn_del() is\nrunning. sco_conn_del() then sees sk == NULL, its own put drops the count\nto zero and frees the conn, and the second put writes to the freed kref:\n\n    BUG: KASAN: slab-use-after-free in sco_conn_put.part.0+0x1a/0x190\n    Write of size 4 at addr ffff8881099dec74 by task kworker/u17:3/413\n    Workqueue: hci1 hci_rx_work\n    Call Trace:\n     sco_conn_put.part.0+0x1a/0x190\n     hci_disconn_complete_evt+0x1ee/0x3e0\n     hci_event_packet+0x54a/0x650\n     hci_rx_work+0x321/0x3d0\n    Allocated by task 413:\n     sco_conn_add+0x72/0x1a0\n     sco_connect_cfm+0x88/0x670\n    Freed by task 413:\n     sco_conn_del.isra.0+0x3f/0xf0\n     hci_disconn_complete_evt+0x1ee/0x3e0\n    refcount_t: underflow; use-after-free.\n\nThe root cause is that the socket stores the connection without holding a\nreference of its own. __sco_chan_add() does:\n\n    sco_pi(sk)-\u003econn = conn;\n\nso the socket borrows whatever reference its caller happened to hold, and\nthe callers paper over that with ad-hoc holds and puts. Give the socket a\ncounted reference instead: __sco_chan_add() takes one and it is released\ntogether with the channel (sco_chan_del()) and in sco_sock_destruct().\nWith the socket holding its own reference, sco_conn_del() no longer needs\nthe extra put and the redundant hold in sco_conn_ready() goes away.\n\nMaking the socket own its reference means the connection is now actually\nfreed on the error paths of sco_connect() where it used to leak, which in\nturn runs sco_conn_free() and its hci_conn_drop(conn-\u003ehcon). To keep the\nhci_conn accounting balanced, make that ownership explicit as well:\nsco_conn_add() consumes one hci_conn reference and the sco_conn owns it for\nits lifetime. sco_connect() hands over the reference returned by\nhci_connect_sco() and no longer drops it on the error paths;\nsco_connect_cfm(), which is not given a reference, takes one with\nhci_conn_hold() before handing it to sco_conn_add() (and drops it again if\nthe allocation fails); and the explicit hci_conn_hold() in sco_conn_ready()\nis removed. Every reference then has a single, clear owner."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The UAF is triggered in sco_conn_del() from hci_disconn_complete_evt on hci_rx_work when the Bluetooth controller reports SCO/eSCO teardown, which is driven by an in-range peer disconnect; Bluetooth SCO is an adjacent-radio protocol path, not a local-only syscall entry point.\nAC:L - The failure is a close()-versus-Disconnection-Complete race where the attacker controls both sides by concurrently closing the SCO socket while inducing HCI disconnect (local threads or a nearby peer hanging up), and can repeat connect/disconnect cycles until the window is hit.\nPR:N - An adjacent Bluetooth peer can send the disconnect that produces Disconnection Complete without any Linux credentials on the victim, and SCO sockets have no capability gate; only an active SCO session on init_net is needed, not root or CAP_NET_ADMIN.\nUI:N - Exploitation does not require victim interaction beyond an already-active SCO link (headset/call); the attacker can time peer-initiated disconnects against automatic socket teardown without social engineering or manual victim steps.\nS:U - The refcount use-after-free corrupts kernel Bluetooth connection state within the same kernel security authority; it is standard kernel memory corruption, not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - sco_conn_del() performs a double sco_conn_put() that writes to a freed kref (4-byte slab UAF), enabling heap reuse and arbitrary kernel memory disclosure primitives consistent with kernel use-after-free confidentiality impact.\nI:H - The post-free kref decrement is a controlled kernel heap write that can be groomed via repeated SCO connect/close and disconnect cycles to corrupt adjacent slab objects and achieve arbitrary write or control-flow hijack.\nA:H - The bug reliably triggers kernel KASAN slab-use-after-free and refcount underflow on hci_rx_work during disconnect handling, producing oops/panic, and can be retriggered to deny service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:10.283Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a33bc07b4730b6cd5681ac77d18ae0de3e739690"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fe627192fa5da7157f9a48608f13c04b6373e43"
        },
        {
          "url": "https://git.kernel.org/stable/c/abd93c85c8667add738ee82aeab95dd9fc8265a2"
        }
      ],
      "title": "Bluetooth: SCO: give the socket its own sco_conn reference",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80683",
    "datePublished": "2026-08-28T06:52:50.099Z",
    "dateReserved": "2026-08-26T14:34:25.784Z",
    "dateUpdated": "2026-08-29T06:22:10.283Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}