{"id":"CVE-2026-98733","state":"PUBLISHED","title":"Bluetooth: hci_core: Serialize fragmented ISO packet queueing","description":"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.","publishedAt":"2026-10-18T15:47:11.210Z","updatedAt":"2026-10-30T12:39:09.881Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"e328b5823fa6b0b160d0922d6d68323e910d09a4","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"545fa70f730eb648a610a2f4b2d270865f77b619","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"d6d709981208567868c5c01ebd1bec5e5e7fdab0","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"708cdd203d0bbcf9255fffb2e4c308d5b28851a7","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"a7161730a3ab3f0a3896000db7ab0284683936e6","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"1a572db43c057566771b485598ad2e66cb390821","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"]}],"references":["https://git.kernel.org/stable/c/e328b5823fa6b0b160d0922d6d68323e910d09a4","https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619","https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0","https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7","https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6","https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98733.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98733","state":"PUBLISHED","datePublished":"2026-10-18T15:47:11.210Z","dateUpdated":"2026-10-30T12:39:09.881Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.367Z"},"containers":{"cna":{"title":"Bluetooth: hci_core: Serialize fragmented ISO packet queueing","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"e328b5823fa6b0b160d0922d6d68323e910d09a4","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"545fa70f730eb648a610a2f4b2d270865f77b619","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"d6d709981208567868c5c01ebd1bec5e5e7fdab0","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"708cdd203d0bbcf9255fffb2e4c308d5b28851a7","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"a7161730a3ab3f0a3896000db7ab0284683936e6","versionType":"git"},{"version":"26afbd826ee326e63a334c37fd45e82e50a615ec","status":"affected","lessThan":"1a572db43c057566771b485598ad2e66cb390821","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e328b5823fa6b0b160d0922d6d68323e910d09a4"},{"url":"https://git.kernel.org/stable/c/545fa70f730eb648a610a2f4b2d270865f77b619"},{"url":"https://git.kernel.org/stable/c/d6d709981208567868c5c01ebd1bec5e5e7fdab0"},{"url":"https://git.kernel.org/stable/c/708cdd203d0bbcf9255fffb2e4c308d5b28851a7"},{"url":"https://git.kernel.org/stable/c/a7161730a3ab3f0a3896000db7ab0284683936e6"},{"url":"https://git.kernel.org/stable/c/1a572db43c057566771b485598ad2e66cb390821"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:09.881Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}