CVE-2026-74302 (GCVE-0-2026-74302)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-10-21 12:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.
References
Impacted products
Vendor Product Version
Linux Linux Version: d6cbce18370641a21dd889e8613d8153df15eb39
Version: 0d151a103775dd9645c78c97f77d6e2a5298d913
Version: 0d151a103775dd9645c78c97f77d6e2a5298d913
Version: 0d151a103775dd9645c78c97f77d6e2a5298d913
Version: 0d151a103775dd9645c78c97f77d6e2a5298d913
Version: 48542881997e17b49dc16b93fe910e0cfcf7a9f9
Version: 9cfc84b1d464cc024286f42a090718f9067b80ed
Version: ddeda6ca5f218b668b560d90fc31ae469adbfd92
Version: d2ce562a5aff1dcd0c50d9808ea825ef90da909f
Version: 96600c2e5ee8213dbab5df1617293d8e847bb4fa
Version: 3f939bd73fed12dddc2a32a76116c19ca47c7678
Version: 6.6.42   ≤
Version: 4.19.319   ≤
Version: 5.4.281   ≤
Version: 5.10.223   ≤
Version: 5.15.164   ≤
Version: 6.1.101   ≤
Version: 6.9.11   ≤
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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\u2014arming 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-\u003ereset function pointer and re-queues cmd_work on hdev-\u003eworkqueue; 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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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74302",
    "datePublished": "2026-08-15T05:58:04.638Z",
    "dateReserved": "2026-08-15T05:44:03.882Z",
    "dateUpdated": "2026-10-21T12:45:17.382Z",
    "state": "PUBLISHED"
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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-\u003ereset function pointer and re-queues cmd_work on hdev-\u003eworkqueue; 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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d6cbce18370641a21dd889e8613d8153df15eb39\", \"lessThan\": \"bce2eec05bce548b548aca52c1834540f97d5d60\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d151a103775dd9645c78c97f77d6e2a5298d913\", \"lessThan\": \"48c7ad6afcc58c2cda11fed39791708103b6a644\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d151a103775dd9645c78c97f77d6e2a5298d913\", \"lessThan\": \"a0fd1086a57b982f8c24ae4ab165c2af39fe1735\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d151a103775dd9645c78c97f77d6e2a5298d913\", \"lessThan\": \"672d52d9412252e61b8de8d773ccdf5a277cf540\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d151a103775dd9645c78c97f77d6e2a5298d913\", \"lessThan\": \"5edcc018fa6e80b2c478454a4a8229c23d67c181\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48542881997e17b49dc16b93fe910e0cfcf7a9f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9cfc84b1d464cc024286f42a090718f9067b80ed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ddeda6ca5f218b668b560d90fc31ae469adbfd92\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d2ce562a5aff1dcd0c50d9808ea825ef90da909f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"96600c2e5ee8213dbab5df1617293d8e847bb4fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3f939bd73fed12dddc2a32a76116c19ca47c7678\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6.6.42\", \"lessThan\": \"6.6.160\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.319\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.281\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.223\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.164\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.101\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.9.11\", \"lessThan\": \"6.10\", \"versionType\": \"semver\"}], \"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\": \"6.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bluetooth/hci_core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/bce2eec05bce548b548aca52c1834540f97d5d60\"}, {\"url\": \"https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644\"}, {\"url\": \"https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735\"}, {\"url\": \"https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540\"}, {\"url\": \"https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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-\u003ereset 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"6.6.42\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.319\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.281\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.223\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.164\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.1.101\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.9.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:45:17.382Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74302\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:45:17.382Z\", \"dateReserved\": \"2026-08-15T05:44:03.882Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:58:04.638Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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