CVE-2026-64408

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Controller\nteardown can clear and release that connection concurrently, leaving the\nnetwork device registration path to dereference a freed parent device.\n\nTake a reference to the L2CAP connection while holding the channel lock.\nRetain it until register_netdev() has taken the parent device reference."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - An adjacent Bluetooth peer can initiate a BNEP/PAN connection that causes privileged bluetoothd to issue BNEPCONNADD, then tear down the ACL link during netdev registration. Exploitation therefore requires Bluetooth radio adjacency.\nAC:L - The peer controls both the connection setup that triggers the ioctl and the competing disconnect, and can repeat attempts until the lifetime window is hit. No condition beyond the attacker's practical control is required.\nPR:N - The adjacent peer needs no Linux credentials or capabilities because root bluetoothd performs the CAP_NET_ADMIN ioctl on its behalf in an enabled, auto-authorized PAN deployment. The direct ioctl requires CAP_NET_ADMIN in the initial user namespace, but the adjacent path does not.\nUI:N - An enabled PAN service can automatically accept or pre-authorize connections, after which setup and teardown require no victim action. Prior service configuration is not user interaction during exploitation.\nS:U - The memory corruption occurs in the host kernel and compromises resources governed by that same kernel security authority. It does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The stale parent points into a freed hci_conn allocation, and reclaiming that use-after-free object can enable disclosure of arbitrary kernel memory. Confidentiality impact is therefore High.\nI:H - device_add() calls get_device() on the freed parent, producing a refcount write into reclaimed memory and potentially further device-list corruption. The use-after-free can support arbitrary kernel-memory corruption or control-flow hijacking.\nA:H - The use-after-free can cause a kernel oops, panic, or corrupted device hierarchy during netdev registration. An adjacent peer can repeatedly initiate and terminate connections to crash the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/bnep/core.c"], "versions": [{"version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "390b5db3ff8745187f094c4e915663b7b1f98944", "status": "affected", "versionType": "git"}, {"version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "46a88784c4c9b96954dd86f747ce93f65efa1302", "status": "affected", "versionType": "git"}, {"version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "551ae773ec64045b4e72099132654887e0270bcc", "status": "affected", "versionType": "git"}, {"version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "ae215c5b6422d8eda443b861b124bd1be6969c31", "status": "affected", "versionType": "git"}, {"version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", 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"7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"}, {"url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"}, {"url": "https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc"}, {"url": "https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31"}, {"url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"}, {"url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"}, {"url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"}, {"url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"}], "title": "Bluetooth: bnep: pin L2CAP connection during netdev registration", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64408", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": 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Exploitation therefore requires Bluetooth radio adjacency.\nAC:L - The peer controls both the connection setup that triggers the ioctl and the competing disconnect, and can repeat attempts until the lifetime window is hit. No condition beyond the attacker's practical control is required.\nPR:N - The adjacent peer needs no Linux credentials or capabilities because root bluetoothd performs the CAP_NET_ADMIN ioctl on its behalf in an enabled, auto-authorized PAN deployment. The direct ioctl requires CAP_NET_ADMIN in the initial user namespace, but the adjacent path does not.\nUI:N - An enabled PAN service can automatically accept or pre-authorize connections, after which setup and teardown require no victim action. Prior service configuration is not user interaction during exploitation.\nS:U - The memory corruption occurs in the host kernel and compromises resources governed by that same kernel security authority. It does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The stale parent points into a freed hci_conn allocation, and reclaiming that use-after-free object can enable disclosure of arbitrary kernel memory. Confidentiality impact is therefore High.\nI:H - device_add() calls get_device() on the freed parent, producing a refcount write into reclaimed memory and potentially further device-list corruption. The use-after-free can support arbitrary kernel-memory corruption or control-flow hijacking.\nA:H - The use-after-free can cause a kernel oops, panic, or corrupted device hierarchy during netdev registration. An adjacent peer can repeatedly initiate and terminate connections to crash the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "390b5db3ff8745187f094c4e915663b7b1f98944", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "46a88784c4c9b96954dd86f747ce93f65efa1302", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "551ae773ec64045b4e72099132654887e0270bcc", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "ae215c5b6422d8eda443b861b124bd1be6969c31", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "df22adc7eafc22e651561813c11dc51a796b12ee", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "a6b22dbd80926556290ad2243be25218d6956a19", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "563a8573047182f550b1e1e030615755cd8c41da", "versionType": "git"}, {"status": "affected", "version": "65f53e9802dbfae0e5758a91793c3f5f8bece49b", "lessThan": "bb067a99a0356196c0b89a95721985485ebce5a5", "versionType": "git"}], "programFiles": ["net/bluetooth/bnep/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": "3.13"}, {"status": "unaffected", "version": "0", "lessThan": "3.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.96", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.39", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.4", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/bnep/core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"}, {"url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"}, {"url": "https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc"}, {"url": "https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31"}, {"url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"}, {"url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"}, {"url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"}, {"url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: pin L2CAP connection during netdev registration\n\nbnep_add_connection() reads the L2CAP connection without holding the\nchannel lock, then passes its HCI device to register_netdev(). 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Controller\nteardown can clear and release that connection concurrently, leaving the\nnetwork device registration path to dereference a freed parent device.\n\nTake a reference to the L2CAP connection while holding the channel lock.\nRetain it until register_netdev() has taken the parent device reference."}], "id": "CVE-2026-64408", "lastModified": "2026-10-19T21:17:36.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64408", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:40:17.231928Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:24.517", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: bnep: pin L2CAP connection during netdev registration", "id": "2507111", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507111"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Bluetooth Network Encapsulation Protocol (BNEP) module of the Linux kernel. The `bnep_add_connection()` function reads the Logical Link Control and Adaptation Protocol (L2CAP) connection without properly holding a channel lock. This can allow a local attacker to trigger a use-after-free vulnerability during network device registration, potentially leading to a system crash and denial of service."], "name": "CVE-2026-64408", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64408\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64408\nhttps://lore.kernel.org/linux-cve-announce/2026072531-CVE-2026-64408-3013@gregkh/T"], "threat_severity": "Moderate"}

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