CVE-2026-98733
Full vulnerability record from the local CVENow database.
Description
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.
View original CVE JSON
{
"id": "CVE-2026-98733",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:17:26.900",
"lastModified": "2026-10-30T13:21:22.107",
"vulnStatus": "Received",
"cveTags": [],
"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->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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/bluetooth/hci_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "26afbd826ee326e63a334c37fd45e82e50a615ec",
"lessThan": "e328b5823fa6b0b160d0922d6d68323e910d09a4",
"versionType": "git",
"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",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/bluetooth/hci_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.0",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.0",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.56",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.10",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e328b5823fa6b0b160d0922d6d68323e910d09a4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}