CVE-2026-90254

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < c2019224a766245b7db39d87fdfe84c3fdc879d9affected
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 193182c6467f508a8a61d5db506d796ffed6eee6affected
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 2e3d827cd56865c14f6ca118bbccd7801091fb21affected
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 9c3b6c1413bd0b4993642d987616331f84d9b7f5affected
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < bb5ca1cc7744c41c59002bd6523714a685ae6595affected
LinuxLinuxc249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 120d8dc042e3d45073bb6e50ee7b058a0b182627affected
LinuxLinux6.1affected
LinuxLinux0 < 6.1unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References