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Bluetooth: hci_core: Serialize fragmented ISO packet queueing

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98733

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98733

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
        "lessThan": "545fa70f730eb648a610a2f4b2d270865f77b619",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
        "lessThan": "d6d709981208567868c5c01ebd1bec5e5e7fdab0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
        "lessThan": "708cdd203d0bbcf9255fffb2e4c308d5b28851a7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
        "lessThan": "a7161730a3ab3f0a3896000db7ab0284683936e6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
        "lessThan": "1a572db43c057566771b485598ad2e66cb390821",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98733

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48932 · Revision 1
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