{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "63f365eb4d1668a04070151b555d55a07ede8d4b"
            },
            {
              "fixed": "10b0e832cc05d7aef4b92bed912cbd4a395d0862"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "c621211b308816889f0a3246de448bfcef8ab3ab"
            },
            {
              "fixed": "1338ee049a8910ba6c9cee963920e978e6893c7d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "907ef6e12fb558a0763e894311eb245a94c192dd"
            },
            {
              "fixed": "02f50e8bb69f9b22516163a09922f5537d3b12d1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5725bc608252050ed8a4d47d59225b7dd73474c8"
            },
            {
              "fixed": "dafc9f57140e66a10945127aa7433c3d715dc253"
            },
            {
              "fixed": "cdd8bbdbee763fdf5bf343e6f7d4e79347739f62"
            },
            {
              "fixed": "5c65b96b549ea2dcfde497436bf9e048deb87758"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "15da883c010cbc2a84aec1738b6ad6ee477846de"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.142"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.94"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
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              "introduced": "6.12.34"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.15.3"
            },
            {
              "fixed": "6.16"
            }
          ],
          "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": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53209.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: reject oversized Broadcast Announcement prepend\n\nExisting advertising instances can already hold the maximum extended\nadvertising payload. When hci_adv_bcast_annoucement() prepends the\nBroadcast Announcement service data to that payload, the combined data\nmay no longer fit in the temporary buffer used to rebuild the\nadvertising data.\n\nReject that case before copying the existing payload and report the\nfailure through the device log. This keeps the existing advertising\ndata intact and avoids overrunning the temporary buffer.",
  "id": "CVE-2026-53209",
  "modified": "2026-07-08T05:38:54.604613954Z",
  "published": "2026-06-25T08:39:14.915Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53209.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53209"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend"
}