GHSA-HF7X-6GQH-PVQM
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-27 15:31In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: Fix advertising data UAFs
hci_find_adv_instance() returns an adv_info pointer that is valid only while hdev->lock is held. The advertising command-sync paths perform instance lookups without that lock and, in some cases, retain the pointer while waiting for a controller response.
An advertising termination event can therefore interleave as follows:
hci_cmd_sync_work hci_rx_work hci_find_adv_instance() __hci_cmd_sync_status() wait for controller reply hci_dev_lock() hci_remove_adv_instance() kfree(adv) adv->scan_rsp_changed = false
KASAN reported:
BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 hci_schedule_adv_instance_sync+0x390/0x4c0 hci_cmd_sync_work+0x173/0x300 Allocated by task 87: hci_add_adv_instance+0x538/0xac0 add_advertising+0x885/0x1160 Freed by task 89: kfree+0x131/0x3c0 hci_remove_adv_instance+0x1d8/0x3b0 hci_le_ext_adv_term_evt+0x17b/0x730
Protect the instance lookup and payload construction in the extended advertising, scan response, and periodic advertising data paths. Snapshot the advertising parameters under hdev->lock, but release the lock before waiting for the controller.
Clear advertising-data dirty bits before issuing their commands and restore them after a failure using a fresh lookup. Likewise, update the reported transmit power through a fresh lookup after the parameter command completes. No adv_info pointer then survives an HCI command wait.
{
"affected": [],
"aliases": [
"CVE-2026-74509"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:17:55Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix advertising data UAFs\n\nhci_find_adv_instance() returns an adv_info pointer that is valid only\nwhile hdev-\u003elock is held. The advertising command-sync paths perform\ninstance lookups without that lock and, in some cases, retain the pointer\nwhile waiting for a controller response.\n\nAn advertising termination event can therefore interleave as follows:\n\n hci_cmd_sync_work hci_rx_work\n hci_find_adv_instance()\n __hci_cmd_sync_status()\n wait for controller reply hci_dev_lock()\n hci_remove_adv_instance()\n kfree(adv)\n adv-\u003escan_rsp_changed = false\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n hci_schedule_adv_instance_sync+0x390/0x4c0\n hci_cmd_sync_work+0x173/0x300\n Allocated by task 87:\n hci_add_adv_instance+0x538/0xac0\n add_advertising+0x885/0x1160\n Freed by task 89:\n kfree+0x131/0x3c0\n hci_remove_adv_instance+0x1d8/0x3b0\n hci_le_ext_adv_term_evt+0x17b/0x730\n\nProtect the instance lookup and payload construction in the extended\nadvertising, scan response, and periodic advertising data paths. Snapshot\nthe advertising parameters under hdev-\u003elock, but release the lock before\nwaiting for the controller.\n\nClear advertising-data dirty bits before issuing their commands and\nrestore them after a failure using a fresh lookup. Likewise, update the\nreported transmit power through a fresh lookup after the parameter command\ncompletes. No adv_info pointer then survives an HCI command wait.",
"id": "GHSA-hf7x-6gqh-pvqm",
"modified": "2026-08-27T15:31:29Z",
"published": "2026-08-15T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74509"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/565971488191bf54a87a417abafab6ad0de72201"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/95cdcd8c82a501931fd3ae9b3811b0b6da167e94"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c4cec575a6d6f7c36808a3a0017b0675968bb06b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cdc36db204ffd97b947d64374cf23a210dc74777"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb1d8318764de7216e6dbba29a24d69f7ce51348"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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