{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c249ea9b4309cf3250c5bbb42a05d38d0ed9071c"
            },
            {
              "fixed": "c2019224a766245b7db39d87fdfe84c3fdc879d9"
            },
            {
              "fixed": "193182c6467f508a8a61d5db506d796ffed6eee6"
            },
            {
              "fixed": "2e3d827cd56865c14f6ca118bbccd7801091fb21"
            },
            {
              "fixed": "9c3b6c1413bd0b4993642d987616331f84d9b7f5"
            },
            {
              "fixed": "bb5ca1cc7744c41c59002bd6523714a685ae6595"
            },
            {
              "fixed": "120d8dc042e3d45073bb6e50ee7b058a0b182627"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90254.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: free the advertising instance on the failure and cancel paths\n\nadv_timeout_expire() hands a kmalloc()ed instance byte to\nhci_cmd_sync_queue() with a NULL destroy callback, and only\nadv_timeout_expire_sync() frees it. That leaks on two paths:\n\n - the return value is not checked, and hci_cmd_sync_queue() does not\n   take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM);\n\n - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry()\n   does not free entry-\u003edata when there is no destroy callback.\n   hci_cmd_sync_clear() cancels every pending entry when the controller\n   is unregistered.\n\nFree the buffer from a destroy callback, and in the caller when the entry\ncould not be queued at all.",
  "id": "CVE-2026-90254",
  "modified": "2026-09-19T03:30:30.823922043Z",
  "published": "2026-09-17T16:07:54.123Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90254.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90254"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths"
}