CVE-2023-53374

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an in-range peer can drop the parent ACL (HCI disconnect / link loss) while SCO or ISO setup still has an unset handle, which is the Adjacent Bluetooth deployment model for phones and headsets.\nAC:L - The attacker controls both sides of the timing window by initiating or observing SCO/ISO setup and then aborting the parent ACL before the child handle is assigned; syzbot reproduced this reliably, and UAF bugs are AC:L unless a truly uncontrollable race is required.\nPR:N - An adjacent Bluetooth peer triggers the vulnerable hci_conn_unlink child cleanup via over-the-air ACL teardown with no local account or capability on the victim; the dangling socket reference is held by ordinary Bluetooth audio stacks already running on the device.\nUI:N - Once Bluetooth is up with a SCO/ISO path in progress (headset/HFP/LE Audio), the peer\u2019s own disconnect drives the free without requiring the victim to open a file, mount anything, or otherwise interact at exploit time.\nS:U - The use-after-free corrupts kernel heap within the same host kernel authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a slab use-after-free of the hci_conn object still referenced by the SCO socket; UAF enables attacker control of freed object contents and arbitrary kernel read primitives.\nI:H - KASAN confirmed a slab-use-after-free write in sco_chan_del via hci_conn_drop/atomic_dec_and_test on the freed hci_conn, which is exploitable for heap corruption and control-flow hijacking.\nA:H - The UAF causes kernel oops/panic under normal close/teardown even when not fully exploited, matching High availability impact for use-after-free bugs."}]}], "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": "ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f", "lessThan": "397d58007532644b35fad746da48c41161f32a57", "status": "affected", "versionType": "git"}, {"version": "ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f", "lessThan": "e94b898463a62b72a2a8b75dea8936bf4db78e00", "status": "affected", "versionType": "git"}, {"version": "ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f", "lessThan": "3344d318337d9dca928fd448e966557ec5063f85", "status": "affected", "versionType": "git"}, {"version": "75e35bd4b7935ceed2aacd82f55940e73bf0b63b", "status": "affected", "versionType": "git"}, {"version": "6.3.8", "lessThan": "6.4", "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": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.16", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5.3", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6", "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": "6.4", "versionEndExcluding": "6.4.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.5.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/397d58007532644b35fad746da48c41161f32a57"}, {"url": "https://git.kernel.org/stable/c/e94b898463a62b72a2a8b75dea8936bf4db78e00"}, {"url": "https://git.kernel.org/stable/c/3344d318337d9dca928fd448e966557ec5063f85"}], "title": "Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2023-53374", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-01-14T18:54:25.271043Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:03:03.307Z"}}]}}

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"negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early\n\nNot calling hci_(dis)connect_cfm before deleting conn referred to by a\nsocket generally results to use-after-free.\n\nWhen cleaning up SCO connections when the parent ACL is deleted too\nearly, use hci_conn_failed to do the connection cleanup properly.\n\nWe also need to clean up ISO connections in a similar situation when\nconnecting has started but LE Create CIS is not yet sent, so do it too\nhere."}], "id": "CVE-2023-53374", "lastModified": "2026-08-04T10:19:03.933", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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{"bugzilla": {"description": "kernel: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early", "id": "2396393", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396393"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53374", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "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": "2025-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53374\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53374\nhttps://lore.kernel.org/linux-cve-announce/2025091855-CVE-2023-53374-d003@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-09-19T09:36:35.349109+00:00", "updated": "2025-09-19T09:36:35.349172+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}