{"id":"CVE-2026-99014","published":"2026-10-23T13:17:24.137","lastModified":"2026-10-24T14:16:52.500","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix command skb lifetime during scan setup\n\nDuring PA sync scan setup, hci_le_set_ext_scan_param_sync() gets the\naddress used for the PA_LINK lookup from hci_sent_cmd_data(). The\nreturned pointer borrows storage from sent_cmd or req_skb, without\nholding a reference to either skb.\n\nThe scan worker runs on req_workqueue while hci_cmd_work() runs on the\nseparate device workqueue. After the scan worker loads sent_cmd, the\ncommand worker can free and replace it before hci_sent_cmd_data()\ndereferences the skb. The command payload can also be freed between\nreturning from the helper and comparing the address. The connection\nlookup's RCU critical section does not protect the command skb.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in hci_sent_cmd_data+0x27c/0x2f0\n  Workqueue: hci0 hci_cmd_sync_work\n  Call Trace:\n   hci_sent_cmd_data+0x27c/0x2f0\n   hci_le_set_scan_param_sync+0x43a/0x850\n   hci_passive_scan_sync+0xb09/0x1460\n   hci_update_passive_scan_sync+0x47c/0x6e0\n   hci_le_pa_create_sync+0x200/0xa70\n   hci_cmd_sync_work+0x13c/0x290\n\n  Allocated by task 95:\n   skb_clone+0x13f/0x340\n   hci_cmd_work+0x2a9/0x7e0\n\n  Freed by task 95:\n   kmem_cache_free+0xba/0x3a0\n   hci_cmd_work+0x29c/0x7e0\n\nUse hdev->lock to serialize the address snapshot with sent_cmd\nreplacement. Protect req_skb replacement and completion cleanup with\nthe same lock because the helper falls back to that skb. Copy the\naddress before releasing the lock and use the copy for the existing\nRCU-protected connection lookup. Release the mutex before sending or\nwaiting for commands, preserving the lookup and completion ordering.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/119ba8070b3f112dd36c897f4f70ea5bb7d370b8","tags":[]},{"url":"https://git.kernel.org/stable/c/762850c203fab1190ad6a3de41cd51920b22236d","tags":[]},{"url":"https://git.kernel.org/stable/c/7db33b36213a3a1a40940c009ddac30670b55922","tags":[]},{"url":"https://git.kernel.org/stable/c/9af12272061d206af8bc3e40215cb694421ab73a","tags":[]},{"url":"https://git.kernel.org/stable/c/f01cbddfb4273fcc9a786d13b0a2525029023605","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}