{"id":"CVE-2026-98733","summary":"Bluetooth: hci_core: Serialize fragmented ISO packet queueing","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Serialize fragmented ISO packet queueing\n\nThe fragmented path in hci_queue_iso() calls __skb_queue_tail() without\nholding conn-\u003edata_q.lock. The socket lock serializes senders, but the\ntransmit worker can concurrently remove packets from this queue using\nskb_dequeue().\n\nAfter an insertion saves the old tail pointer, hci_sched_iso() can dequeue\nthat packet and pass it to the driver. The driver can free the packet\nbefore the insertion resumes and writes to the old tail's next pointer,\ncausing a use-after-free. Concurrent updates can also corrupt the queue.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in hci_send_iso+0xc7d/0xe10\n  Call Trace:\n   hci_send_iso+0xc7d/0xe10\n   iso_sock_sendmsg+0x710/0x900\n   __sys_sendto+0x34a/0x3a0\n\n  Allocated by task 86:\n   __alloc_skb+0xdd/0x820\n   alloc_skb_with_frags+0x7e/0x770\n   sock_alloc_send_pskb+0x67a/0x820\n   bt_skb_sendmsg.constprop.0+0xc0/0x6c0\n   iso_sock_sendmsg+0x44e/0x900\n\n  Freed by task 90:\n   kmem_cache_free+0xcb/0x3d0\n   vhci_read+0x33f/0x4d0\n   vfs_read+0x177/0xa20\n\nHold the queue lock across the entire fragment batch, as hci_queue_acl()\ndoes, to serialize insertion against dequeue while preserving fragment\nordering.","modified":"2026-10-20T02:30:15.381159644Z","published":"2026-10-18T15:47:11.210Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98733.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821"},{"type":"WEB","url":"https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98733.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98733"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"26afbd826ee326e63a334c37fd45e82e50a615ec"},{"fixed":"d6d709981208567868c5c01ebd1bec5e5e7fdab0"},{"fixed":"708cdd203d0bbcf9255fffb2e4c308d5b28851a7"},{"fixed":"a7161730a3ab3f0a3896000db7ab0284683936e6"},{"fixed":"1a572db43c057566771b485598ad2e66cb390821"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98733.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98733.json"}}],"schema_version":"1.9.0"}