{"schema":"threatline.record/2","record":{"id":"CVE-2026-98733","aliases":[],"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->data_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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","source_modified_at":"2026-10-21T12:56:09.003Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","lessThan":"545fa70f730eb648a610a2f4b2d270865f77b619","status":"affected","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","lessThan":"d6d709981208567868c5c01ebd1bec5e5e7fdab0","status":"affected","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","lessThan":"708cdd203d0bbcf9255fffb2e4c308d5b28851a7","status":"affected","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","lessThan":"a7161730a3ab3f0a3896000db7ab0284683936e6","status":"affected","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","lessThan":"1a572db43c057566771b485598ad2e66cb390821","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","source_modified_at":"2026-10-21T12:56:09.003Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","source_modified_at":"2026-10-21T12:56:09.003Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"545fa70f730eb648a610a2f4b2d270865f77b619","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","source_modified_at":"2026-10-21T12:56:09.003Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"708cdd203d0bbcf9255fffb2e4c308d5b28851a7","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","source_modified_at":"2026-10-21T12:56:09.003Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1a572db43c057566771b485598ad2e66cb390821","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05724,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:47:11.210Z","modified_at":"2026-10-21T12:56:09.003Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98733","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:56:09.003Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98733","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:56:09.003Z","content_hash":"7cbae72f2885f0de7b56800ea6f32b092966e39aeaa1b3ab177184a2e89ec669"}}