CVE-2026-43019

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Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable `set_cig_params_sync` path is reached through local AF_BLUETOOTH ISO socket operations such as creating a `BTPROTO_ISO` socket, setting ISO QoS/deferred setup, and calling `connect()` or deferred `recvmsg()`. A Bluetooth peer may be involved in normal CIS use, but the vulnerable queueing and racing can be driven by local socket syscalls.\nAC:L - The bug is a race/use-after-free, but the attacker can control the relevant operations by repeatedly creating/binding/connecting and closing ISO sockets while the HCI command work item runs asynchronously. The fix adds `hci_dev_lock`, indicating normal locking, not rare external state, is the missing condition.\nPR:L - AF_BLUETOOTH ISO socket creation and the relevant `BT_ISO_QOS`, `BT_DEFER_SETUP`, and `connect()` path do not require CAP_NET_ADMIN or another privileged check in the inspected path. The attacker needs local code execution as an unprivileged user on a system with a running Bluetooth ISO-capable controller.\nUI:N - No victim action is required once the local attacker can execute socket syscalls. The attacker can create, configure, connect, and close the sockets directly.\nS:U - The vulnerability corrupts or reuses memory within the kernel Bluetooth/HCI connection management context. Exploitation would be kernel compromise or denial of service within the same security authority, not a boundary crossing such as guest-to-host escape.\nC:H - This is a use-after-free of `struct hci_conn`, with freed object fields read after lookup without holding the device lock. Per kernel UAF scoring guidance and plausible heap reuse, this can support high confidentiality impact.\nI:H - The stale `hci_conn` contents are used to build HCI command parameters, and UAF conditions in kernel heap objects are generally exploitable with heap grooming for control/data corruption. Following the required higher-severity rule for UAFs, integrity impact is High.\nA:H - A stale `hci_conn` dereference in asynchronous HCI command work can trigger kernel memory safety failures, including KASAN-detected slab-use-after-free, oops, or panic. Repeated local triggering makes denial of service high impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_conn.c"], "versions": [{"version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "7502c1cf303b69f71d085f5ff7251b0e1b0f09df", "status": "affected", "versionType": "git"}, {"version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "66d432e9b45bae7881ffcdb12cd8fd0bf254ef02", "status": "affected", "versionType": "git"}, {"version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "7d568fede8eac91161a60b710aa920abe9b0fb9f", "status": "affected", "versionType": "git"}, {"version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "bad65b4b0a96139f023eadc28a33125963208449", "status": "affected", "versionType": "git"}, {"version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "a2639a7f0f5bf7d73f337f8f077c19415c62ed2c", "status": "affected", "versionType": "git"}, {"version": "3a273cd0f47dd672d37736e623849374f9ab9ce9", "status": "affected", "versionType": "git"}, {"version": "d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062", "status": "affected", "versionType": "git"}, {"version": "6.4.16", "lessThan": "6.5", "status": "affected", "versionType": "semver"}, {"version": "6.5.3", "lessThan": "6.6", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_conn.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"}, {"url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"}, {"url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"}, {"url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"}, {"url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"}], "title": "Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43019", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:13:33.625290Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:09.770Z"}}]}}

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A Bluetooth peer may be involved in normal CIS use, but the vulnerable queueing and racing can be driven by local socket syscalls.\nAC:L - The bug is a race/use-after-free, but the attacker can control the relevant operations by repeatedly creating/binding/connecting and closing ISO sockets while the HCI command work item runs asynchronously. The fix adds `hci_dev_lock`, indicating normal locking, not rare external state, is the missing condition.\nPR:L - AF_BLUETOOTH ISO socket creation and the relevant `BT_ISO_QOS`, `BT_DEFER_SETUP`, and `connect()` path do not require CAP_NET_ADMIN or another privileged check in the inspected path. The attacker needs local code execution as an unprivileged user on a system with a running Bluetooth ISO-capable controller.\nUI:N - No victim action is required once the local attacker can execute socket syscalls. The attacker can create, configure, connect, and close the sockets directly.\nS:U - The vulnerability corrupts or reuses memory within the kernel Bluetooth/HCI connection management context. Exploitation would be kernel compromise or denial of service within the same security authority, not a boundary crossing such as guest-to-host escape.\nC:H - This is a use-after-free of `struct hci_conn`, with freed object fields read after lookup without holding the device lock. Per kernel UAF scoring guidance and plausible heap reuse, this can support high confidentiality impact.\nI:H - The stale `hci_conn` contents are used to build HCI command parameters, and UAF conditions in kernel heap objects are generally exploitable with heap grooming for control/data corruption. Following the required higher-severity rule for UAFs, integrity impact is High.\nA:H - A stale `hci_conn` dereference in asynchronous HCI command work can trigger kernel memory safety failures, including KASAN-detected slab-use-after-free, oops, or panic. Repeated local triggering makes denial of service high impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "7502c1cf303b69f71d085f5ff7251b0e1b0f09df", "versionType": "git"}, {"status": "affected", "version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "66d432e9b45bae7881ffcdb12cd8fd0bf254ef02", "versionType": "git"}, {"status": "affected", "version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "7d568fede8eac91161a60b710aa920abe9b0fb9f", "versionType": "git"}, {"status": "affected", "version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "bad65b4b0a96139f023eadc28a33125963208449", "versionType": "git"}, {"status": "affected", "version": "a091289218202bc09d9b9caa8afcde1018584aec", "lessThan": "a2639a7f0f5bf7d73f337f8f077c19415c62ed2c", "versionType": "git"}, {"status": "affected", "version": "3a273cd0f47dd672d37736e623849374f9ab9ce9", "versionType": "git"}, {"status": "affected", "version": "d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062", "versionType": "git"}, {"status": "affected", "version": "6.4.16", "lessThan": "6.5", "versionType": "semver"}, {"status": "affected", "version": "6.5.3", "lessThan": "6.6", "versionType": "semver"}], "programFiles": ["net/bluetooth/hci_conn.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"status": "unaffected", "version": "0", "lessThan": "6.6", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/hci_conn.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"}, {"url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"}, {"url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"}, {"url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"}, {"url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it's possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently. Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.5.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:18.558Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43019", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:09.770Z", "dateReserved": "2026-05-01T14:12:55.975Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-01T14:15:23.035Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_conn: soluciona una posible UAF en set_cig_params_sync\n\nLa b\u00fasqueda de hci_conn y el acceso a campos deben estar cubiertos por el bloqueo hdev en set_cig_params_sync, de lo contrario, es posible que se libere concurrentemente.\n\nTomar el bloqueo hdev para evitar que hci_conn sea eliminado o modificado concurrentemente. Solo el bloqueo RCU no es adecuado aqu\u00ed, ya que tambi\u00e9n queremos evitar el \u2019tearing\u2019 en la configuraci\u00f3n."}], "id": "CVE-2026-43019", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43019", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:13:33.625290Z", "version": "2.0.3"}}]}, "published": "2026-05-01T15:16:46.103", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync", "id": "2464408", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464408"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel's Bluetooth component. Improper synchronization in the `set_cig_params_sync` function can lead to a use-after-free (UAF) vulnerability. This issue arises when `hci_conn` objects are accessed without proper locking, allowing them to be freed concurrently. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code."], "name": "CVE-2026-43019", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43019\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43019\nhttps://lore.kernel.org/linux-cve-announce/2026050157-CVE-2026-43019-0c5c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a091289218202bc09d9b9caa8afcde1018584aec,66d432e9b45bae7881ffcdb12cd8fd0bf254ef02)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a091289218202bc09d9b9caa8afcde1018584aec,7d568fede8eac91161a60b710aa920abe9b0fb9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a091289218202bc09d9b9caa8afcde1018584aec,bad65b4b0a96139f023eadc28a33125963208449)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a091289218202bc09d9b9caa8afcde1018584aec,a2639a7f0f5bf7d73f337f8f077c19415c62ed2c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3a273cd0f47dd672d37736e623849374f9ab9ce9"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T22:30:15.968157+00:00", "updated": "2026-10-23T08:00:17.773969+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362", "CWE-416", "CWE-821"]}