CVE-2026-98733 (GCVE-0-2026-98733)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39
VLAI
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < e328b5823fa6b0b160d0922d6d68323e910d09a4 (git)
Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < 545fa70f730eb648a610a2f4b2d270865f77b619 (git)
Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < d6d709981208567868c5c01ebd1bec5e5e7fdab0 (git)
Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < 708cdd203d0bbcf9255fffb2e4c308d5b28851a7 (git)
Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < a7161730a3ab3f0a3896000db7ab0284683936e6 (git)
Affected: 26afbd826ee326e63a334c37fd45e82e50a615ec , < 1a572db43c057566771b485598ad2e66cb390821 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:09.881Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/e328b5823fa6b0b160d0922d6d68323e910d09a4"
        },
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          "url": "https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821"
        }
      ],
      "title": "Bluetooth: hci_core: Serialize fragmented ISO packet queueing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "datePublished": "2026-10-18T15:47:11.210Z",
    "dateReserved": "2026-09-25T10:25:14.367Z",
    "dateUpdated": "2026-10-30T12:39:09.881Z",
    "state": "PUBLISHED"
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      "id": "msrc_CVE-2026-98733",
      "initial_release_date": "2026-10-20T01:04:47.000Z",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: hci_core: Serialize fragmented ISO packet queueing",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98733.json",
      "version": "3"
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          {
            "lang": "en",
            "value": "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\u0027s 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."
          }
        ],
        "id": "CVE-2026-98733",
        "lastModified": "2026-10-30T13:21:22.107",
        "metrics": {},
        "published": "2026-10-18T16:17:26.900",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-10-21T02:11:28+00:00",
      "cve": "CVE-2026-98733",
      "id": "CVE-2026-98733",
      "initial_release_date": "2026-10-18T15:47:11.210000+00:00",
      "product_status:known_affected": "77",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via use-after-free in Bluetooth ISO packet queueing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98733.json",
      "version": "3"
    },
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      "current_release_date": "2026-11-04T17:52:35Z",
      "cve": "CVE-2026-98733",
      "id": "CVE-2026-98733",
      "initial_release_date": "2026-10-18T23:43:00Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "309",
      "product_status:recommended": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98733",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98733.json",
      "version": "6"
    }
  }
}



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