Bluetooth: hci_core: Serialize fragmented ISO packet queueing

{
  "id": "8d06b7865171ec5b7001bdddb37bc4d2e250c6060f958bf52e1eeb9acae4dac8",
  "url": "https://osv.dev/vulnerability/CVE-2026-98733",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_core: Serialize fragmented ISO packet queueing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Serialize fragmented ISO packet queueing The fragmented path in hci_queue_iso() calls __skb_queue_tail() without holding conn->data_q.lock. The socket lock serializes senders, but the transmit worker can concurrently remove packets from this queue using skb_dequeue(). After an insertion saves the old tail pointer, hci_sched_iso() can dequeue that packet and pass it to the driver. The driver can free the packet before the insertion resumes and writes to the old tail's next pointer, causing a use-after-free. Concurrent updates can also corrupt the queue. KASAN reported: BUG: KASAN: slab-use-after-free in hci_send_iso+0xc7d/0xe10 Call Trace: hci_send_iso+0xc7d/0xe10 iso_sock_sendmsg+0x710/0x900 __sys_sendto+0x34a/0x3a0 Allocated by task 86: __alloc_skb+0xdd/0x820 alloc_skb_with_frags+0x7e/0x770 sock_alloc_send_pskb+0x67a/0x820 bt_skb_sendmsg.constprop.0+0xc0/0x6c0 iso_sock_sendmsg+0x44e/0x900 Freed by task 90: kmem_cache_free+0xcb/0x3d0 vhci_read+0x33f/0x4d0 vfs_read+0x177/0xa20 Hold the queue lock across the entire fragment batch, as hci_queue_acl() does, to serialize insertion against dequeue while preserving fragment ordering.",
    "evidence": "osv:CVE-2026-98733",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.6.160",
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            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.10",
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98733",
      "aliases": [
        "CVE-2026-98733"
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                  "fixed": "d6d709981208567868c5c01ebd1bec5e5e7fdab0"
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                {
                  "fixed": "708cdd203d0bbcf9255fffb2e4c308d5b28851a7"
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                  "fixed": "a7161730a3ab3f0a3896000db7ab0284683936e6"
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                  "fixed": "1a572db43c057566771b485598ad2e66cb390821"
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          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-11-01T02:30:54.769725850Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821",
        "https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619",
        "https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7",
        "https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6",
        "https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0",
        "https://git.kernel.org/stable/c/e328b5823fa6b0b160d0922d6d68323e910d09a4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98733.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98733",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98733.json"
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    "related_cves": [
      {
        "value": "CVE-2026-98733",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520914,
  "published_at": "2026-10-18T15:47:11.21+00:00"
}