{"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":"medium","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90254.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90254"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536160"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90254"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90254"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90254.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.843Z","epss":0.00206,"epssPercentile":0.10514,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-772"],"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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90254.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216221,"id":"CVE-2026-90254","ts":1791274041704,"field":"cvss","old":null,"new":"5.5"},{"seq":216220,"id":"CVE-2026-90254","ts":1791274041704,"field":"severity","old":"none","new":"medium"}]}