{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "efc30877bd4bc85fefe98d80af60fafc86e5775e"
            },
            {
              "fixed": "11a87dd5df428a4b79a84d2790cac7f3c73f1f0d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "f87271d21dd4ee83857ca11b94e7b4952749bbae"
            },
            {
              "fixed": "c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "ab4eedb790cae44313759b50fe47da285e2519d5"
            },
            {
              "fixed": "da3000cbe4851458a22be38bb18c0689c39fdd5f"
            },
            {
              "fixed": "71030f3b3015a412133a805ff47970cdcf30c2b8"
            },
            {
              "fixed": "752a6c9596dd25efd6978a73ff21f3b592668f4a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "18ab6b6078fa8191ca30a3065d57bf35d5635761"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.84"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.20"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.13.8"
            },
            {
              "fixed": "6.14"
            }
          ],
          "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": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.19.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23461.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user\n\nAfter commit ab4eedb790ca (\"Bluetooth: L2CAP: Fix corrupted list in\nhci_chan_del\"), l2cap_conn_del() uses conn-\u003elock to protect access to\nconn-\u003eusers. However, l2cap_register_user() and l2cap_unregister_user()\ndon't use conn-\u003elock, creating a race condition where these functions can\naccess conn-\u003eusers and conn-\u003ehchan concurrently with l2cap_conn_del().\n\nThis can lead to use-after-free and list corruption bugs, as reported\nby syzbot.\n\nFix this by changing l2cap_register_user() and l2cap_unregister_user()\nto use conn-\u003elock instead of hci_dev_lock(), ensuring consistent locking\nfor the l2cap_conn structure.",
  "id": "CVE-2026-23461",
  "modified": "2026-07-08T05:38:27.816105974Z",
  "published": "2026-04-03T15:15:41.051Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23461.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23461"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user"
}