{"id":"CVE-2026-90254","title":"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 …","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < c2019224a766245b7db39d87fdfe84c3fdc879d9","Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 193182c6467f508a8a61d5db506d796ffed6eee6","Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 2e3d827cd56865c14f6ca118bbccd7801091fb21","Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 9c3b6c1413bd0b4993642d987616331f84d9b7f5","Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < bb5ca1cc7744c41c59002bd6523714a685ae6595","Linux >= c249ea9b4309cf3250c5bbb42a05d38d0ed9071c < 120d8dc042e3d45073bb6e50ee7b058a0b182627","Linux 6.1"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:21.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90254","references":[{"url":"https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.843Z","epss":0.00205,"epssPercentile":0.10889,"slug":"CVE-2026-90254","body":"## Overview\n\nIn 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->data 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}