CVE-2026-52918

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child references under\nthe queue lock before dropping it and locking the child socket."}], "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 - The vulnerable accept queue is in the Bluetooth socket stack and is reachable through nearby Bluetooth peers opening and tearing down L2CAP/RFCOMM-style connections to a listening Bluetooth service.\nAC:L - The race can be exercised repeatedly by driving connection and disconnection activity while the listener polls/accepts, and no rare kernel configuration or condition outside the attacker\u2019s reasonable influence is required.\nPR:N - An adjacent Bluetooth peer can reach the incoming connection and teardown paths without local system privileges or prior authenticated application access in low-security/default Bluetooth service scenarios.\nUI:N - No victim user action is required once the Bluetooth service/socket is listening; the attacker can initiate the relevant Bluetooth protocol traffic.\nS:U - The bug affects kernel Bluetooth socket state within the same host security authority and does not cross a VM, IOMMU, or similar security boundary.\nC:H - The bug is a use-after-free/unsynchronized traversal of freed socket objects; under the required conservative scoring rule, UAF exposure is treated as potentially enabling high-impact kernel information disclosure.\nI:H - The fixed code also pins children during dequeue to prevent references to freed objects, and UAF/refcount operations on reclaimed kernel memory are conservatively treated as potentially enabling memory corruption or control-flow compromise.\nA:H - A failed race or invalid traversal can dereference freed or attacker-influenced kernel memory, producing a kernel oops/panic or repeated Bluetooth service/kernel disruption."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: serialize accept_q access\n\nbt_sock_poll() walks the accept queue without synchronization, while\nchild teardown can unlink the same socket and drop its last reference.\nThe unsynchronized accept queue walk has existed since the initial\nBluetooth import.\n\nProtect accept_q with a dedicated lock for queue updates and polling.\nAlso rework bt_accept_dequeue() to take temporary child references under\nthe queue lock before dropping it and locking the child socket."}], "id": "CVE-2026-52918", "lastModified": "2026-10-19T20:18:46.520", "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-2026-52918", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:22:41.536262Z", "version": "2.0.3"}}]}, "published": "2026-06-24T08:16:21.713", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41c8c1c7923e86e0eb59cfb4279349112756a336"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ec17782fd186f901a7329605d11048b085b945a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/85f8674cae82053f1e6bab295f6a8422cca14db5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b4c412e001b0c670eb937beab491af974da55b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a218bf69eb51fefe59a3976fa8925261141f681c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be43e6b4043113c3b3cf887c3c8350f67140274c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9ce4de05df2385c19e2c7d12f529144e1a44af1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e83f5e24da741fa9405aeeff00b08c5ee7c37b88"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "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-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: serialize accept_q access", "id": "2492092", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492092"}, "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-820", "details": ["A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition exists in the handling of the `accept_q` within the `bt_sock_poll()` function due to a lack of synchronization. This could allow a local attacker to cause a denial of service by manipulating socket operations during child teardown, leading to system instability."], "name": "CVE-2026-52918", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52918\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52918\nhttps://lore.kernel.org/linux-cve-announce/2026062429-CVE-2026-52918-42b9@gregkh/T"], "threat_severity": "Moderate"}

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