Answer in brief
CVE-2026-90254 records a Unknown severity vulnerability in Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <c2019224a766245b7db39d87fdfe84c3fdc879d9 || >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <193182c6467f508a8a61d5db506d796ffed6eee6 || >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <2e3d827cd56865c14f6ca118bbccd7801091fb21 || >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <9c3b6c1413bd0b4993642d987616331f84d9b7f5 || >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <bb5ca1cc7744c41c59002bd6523714a685ae6595 || >=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <120d8dc042e3d45073bb6e50ee7b058a0b182627 | c2019224a766245b7db39d87fdfe84c3fdc879d9, 193182c6467f508a8a61d5db506d796ffed6eee6, 2e3d827cd56865c14f6ca118bbccd7801091fb21, 9c3b6c1413bd0b4993642d987616331f84d9b7f5, bb5ca1cc7744c41c59002bd6523714a685ae6595, 120d8dc042e3d45073bb6e50ee7b058a0b182627 |
| Linux/Linuxgeneric | 6.1 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.