CVE-2026-90254
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627
- https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6
- https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21
- https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5
- https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595
- https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.