{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8ffb929098a56939ac71509302eeab5b207bf262"
            },
            {
              "fixed": "b39298044e5534612511a2ff5de03ba5f6e7a820"
            },
            {
              "fixed": "8c37e4338c801ebb8cee52436c01c41e009f6e87"
            },
            {
              "fixed": "84e718b6a814edc84159361f9f454a4e92ae91ae"
            },
            {
              "fixed": "36da806f7fbaee56ad9e81859deec203f9728700"
            },
            {
              "fixed": "733e76e74e406c1d1ddc7369420dd8a47f48bb8a"
            },
            {
              "fixed": "6fef032af0092ed5ccb767239a9ac1bc38c08a40"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64557.json"
  },
  "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)-\u003echan 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 -\u003enew_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.",
  "id": "CVE-2026-64557",
  "modified": "2026-08-18T03:31:10.174516269Z",
  "published": "2026-07-29T08:01:47.462Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36da806f7fbaee56ad9e81859deec203f9728700"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fef032af0092ed5ccb767239a9ac1bc38c08a40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/733e76e74e406c1d1ddc7369420dd8a47f48bb8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84e718b6a814edc84159361f9f454a4e92ae91ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c37e4338c801ebb8cee52436c01c41e009f6e87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b39298044e5534612511a2ff5de03ba5f6e7a820"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64557.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64557"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "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_sock_new_connection_cb()"
}