348 lines
18 KiB
JSON
348 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74302",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.882Z",
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"datePublished": "2026-08-15T05:58:04.638Z",
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"dateUpdated": "2026-10-30T12:29:39.077Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:29:39.077Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix UAF in hci_unregister_dev()\n\nhci_unregister_dev() does not disable cmd_timer and ncmd_timer\nbefore the hci_dev structure is freed. If a timeout fires\nduring device teardown, the callback dereferences freed memory\n(including the hdev->reset function pointer), leading to a\nuse-after-free.\n\nAdd disable_delayed_work_sync() calls alongside the existing\ndisable_work_sync() calls to ensure both timers are fully\nquiesced before teardown proceeds."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is reached only during hci_unregister_dev() teardown (e.g. closing /dev/vhci, USB/btusb disconnect, hci_ldisc detach, or driver removal); adjacent Bluetooth peers can arm cmd_timer/ncmd_timer via HCI timeouts but cannot invoke unregister, so exploitation requires local device/syscall access.\nAC:L - An attacker controls both sides of the race—arming cmd_timer (2s) or ncmd_timer (4s) by withholding HCI command completions while closing /dev/vhci to run hci_unregister_dev(), and disable_work_sync(cmd_work) can queue cmd_timer immediately before teardown; the cycle is repeatable.\nPR:L - vhci_open() has no capable() check, so any principal granted /dev/vhci (syzkaller, containers, Android bluetooth uid, permissive udev) can create/destroy virtual HCI controllers and inject frames without init-namespace root, matching prior hci_unregister_dev teardown UAF scores.\nUI:N - The attacker performs device creation, HCI traffic injection, and teardown from its own process via open/write/close on /dev/vhci or equivalent local transport; no victim interaction or cooperation is required beyond existing device-node access.\nS:U - Corruption is confined to kernel slab memory and workqueue/timer state within the same kernel security authority; exploitation yields standard kernel privilege escalation, not VM escape, IOMMU bypass, or cross-sandbox boundary crossing.\nC:H - hci_cmd_timeout() and hci_ncmd_timeout() dereference the freed hci_dev (req_skb, flags, workqueue, name) after kfree(); UAF on the hci_dev slab enables controlled reallocation and arbitrary kernel memory read/pointer disclosure via heap spraying.\nI:H - hci_cmd_timeout() invokes the freed hdev->reset function pointer and re-queues cmd_work on hdev->workqueue; attacker-controlled contents in the reclaimed hci_dev object provide arbitrary write and control-flow hijack primitives per kernel UAF scoring guidance.\nA:H - Timer callbacks operating on freed hci_dev memory cause KASAN slab-use-after-free reports, kernel oops/panic, and can queue work onto destroyed workqueues; even failed exploitation reliably crashes or hangs the affected controller path."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bluetooth/hci_core.c"
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],
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"versions": [
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{
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"version": "96600c2e5ee8213dbab5df1617293d8e847bb4fa",
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"lessThan": "c277f624cd99e4f0e0223fd039b7615feea4afdc",
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"status": "affected",
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"version": "d6cbce18370641a21dd889e8613d8153df15eb39",
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},
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{
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"version": "3f939bd73fed12dddc2a32a76116c19ca47c7678",
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"status": "affected",
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},
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{
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"version": "6.1.101",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.42",
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"status": "affected",
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},
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{
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"version": "4.19.319",
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"lessThan": "4.20",
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"status": "affected",
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},
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{
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"version": "5.4.281",
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"lessThan": "5.5",
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"status": "affected",
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},
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{
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"version": "5.10.223",
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"status": "affected",
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},
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{
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"net/bluetooth/hci_core.c"
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],
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{
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c277f624cd99e4f0e0223fd039b7615feea4afdc"
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},
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{
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"url": "https://git.kernel.org/stable/c/bce2eec05bce548b548aca52c1834540f97d5d60"
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},
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{
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"url": "https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644"
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},
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{
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"url": "https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735"
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"url": "https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540"
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{
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"url": "https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181"
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}
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],
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"title": "Bluetooth: hci_core: Fix UAF in hci_unregister_dev()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74302",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:52:48.387407Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T18:55:31.734Z"
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}
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}
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]
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}
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} |