GHSA-CQ3P-99WV-3CQF
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
adv_timeout_expire() hands a kmalloc()ed instance byte to hci_cmd_sync_queue() with a NULL destroy callback, and only adv_timeout_expire_sync() frees it. That leaks on two paths:
-
the return value is not checked, and hci_cmd_sync_queue() does not take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM);
-
a cancelled entry is not released, as _hci_cmd_sync_cancel_entry() does not free entry->data when there is no destroy callback. hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered.
Free the buffer from a destroy callback, and in the caller when the entry could not be queued at all.
{
"affected": [],
"aliases": [
"CVE-2026-90254"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:21Z",
"severity": null
},
"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": "GHSA-cq3p-99wv-3cqf",
"modified": "2026-09-17T18:31:57Z",
"published": "2026-09-17T18:31:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90254"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}
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