CVE-2023-54214

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Per kernel scoring convention Bluetooth-reachable bugs are Adjacent.\nAC:L - The attacker controls both sides of the race: withholding L2CAP credits (or ACL buffers) parks the sender in the blocking `bt_skb_send_alloc()` with the chan lock released for an unbounded time, and the attacker then terminates the link to run `l2cap_conn_del()`/`kfree(conn)` inside that window. This makes the race deterministic rather than dependent on timing luck.\nPR:N - No local account and no privileges are needed \u2014 the sending side is the kernel's own RFCOMM session or a system Bluetooth daemon, and L2CAP/LE CoC channels at BT_SECURITY_LOW accept connections without pairing or authentication. The attacker is purely an unauthenticated adjacent device.\nUI:N - Exploitation needs only a connectable/discoverable target or an already-established profile connection; the freed-conn dereference happens entirely within normal send and link-teardown handling. No victim action is required.\nS:U - The corruption and its consequences are confined to the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety issue.\nC:H - This is a use-after-free read of a freed `struct l2cap_conn` slab object whose contents the attacker can influence by reclaiming the slot with heap spray, and the value read (`conn->mtu`) feeds fragment sizing and copy loops. UAF of an attacker-groomable object is treated as enabling arbitrary read.\nI:H - The dangling `l2cap_conn` is used to drive skb allocation and fragmentation while the freed slab is attacker-reclaimable, giving heap-grooming leverage over subsequent kernel allocations and control-flow-relevant state. Per kernel guidance a use-after-free is scored as exploitable for arbitrary write/control-flow hijack.\nA:H - The freed-object read reliably oopses under any hardening (KASAN/slab poisoning) and, when the reclaimed `conn->mtu` reads as 0, `count` becomes 0 so `len` never decreases \u2014 an infinite skb-allocation loop causing hang and memory exhaustion. Either outcome is a full denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/l2cap_core.c", "net/bluetooth/l2cap_sock.c"], "versions": [{"version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "b2fde8cb2a25125111f2144604e0e7c0ebcc4bba", "status": "affected", "versionType": "git"}, {"version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49", "status": "affected", "versionType": "git"}, {"version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "60aaccf16d1e099c16bebfb96428ae762cb528f7", "status": "affected", "versionType": "git"}, {"version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "b8ed41cc04fb74005aa51d17865ca3d022760335", "status": "affected", "versionType": "git"}, {"version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": 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"versionEndExcluding": "6.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b2fde8cb2a25125111f2144604e0e7c0ebcc4bba"}, {"url": "https://git.kernel.org/stable/c/a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49"}, {"url": "https://git.kernel.org/stable/c/60aaccf16d1e099c16bebfb96428ae762cb528f7"}, {"url": "https://git.kernel.org/stable/c/b8ed41cc04fb74005aa51d17865ca3d022760335"}, {"url": "https://git.kernel.org/stable/c/31a288a4df7f6a28e65da22a4ab2add4a963738e"}, {"url": "https://git.kernel.org/stable/c/64e28ecf44e46de9f01915a4146706a21c3469d2"}, {"url": "https://git.kernel.org/stable/c/994e3e18908f5c4a12d07b44018e6aa85f071048"}, {"url": "https://git.kernel.org/stable/c/df5703348813235874d851934e957c3723d71644"}], "title": "Bluetooth: L2CAP: Fix potential user-after-free", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54214", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:39:26.318408Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:41.834Z"}}]}}

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Per kernel scoring convention Bluetooth-reachable bugs are Adjacent.\nAC:L - The attacker controls both sides of the race: withholding L2CAP credits (or ACL buffers) parks the sender in the blocking `bt_skb_send_alloc()` with the chan lock released for an unbounded time, and the attacker then terminates the link to run `l2cap_conn_del()`/`kfree(conn)` inside that window. This makes the race deterministic rather than dependent on timing luck.\nPR:N - No local account and no privileges are needed \u2014 the sending side is the kernel's own RFCOMM session or a system Bluetooth daemon, and L2CAP/LE CoC channels at BT_SECURITY_LOW accept connections without pairing or authentication. The attacker is purely an unauthenticated adjacent device.\nUI:N - Exploitation needs only a connectable/discoverable target or an already-established profile connection; the freed-conn dereference happens entirely within normal send and link-teardown handling. No victim action is required.\nS:U - The corruption and its consequences are confined to the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety issue.\nC:H - This is a use-after-free read of a freed `struct l2cap_conn` slab object whose contents the attacker can influence by reclaiming the slot with heap spray, and the value read (`conn->mtu`) feeds fragment sizing and copy loops. UAF of an attacker-groomable object is treated as enabling arbitrary read.\nI:H - The dangling `l2cap_conn` is used to drive skb allocation and fragmentation while the freed slab is attacker-reclaimable, giving heap-grooming leverage over subsequent kernel allocations and control-flow-relevant state. Per kernel guidance a use-after-free is scored as exploitable for arbitrary write/control-flow hijack.\nA:H - The freed-object read reliably oopses under any hardening (KASAN/slab poisoning) and, when the reclaimed `conn->mtu` reads as 0, `count` becomes 0 so `len` never decreases \u2014 an infinite skb-allocation loop causing hang and memory exhaustion. Either outcome is a full denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "b2fde8cb2a25125111f2144604e0e7c0ebcc4bba", "versionType": "git"}, {"status": "affected", "version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49", "versionType": "git"}, {"status": "affected", "version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "60aaccf16d1e099c16bebfb96428ae762cb528f7", "versionType": "git"}, {"status": "affected", "version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "b8ed41cc04fb74005aa51d17865ca3d022760335", "versionType": "git"}, {"status": "affected", "version": "a6a5568c03c4805d4d250f6bd9d468eeeb4ea059", "lessThan": "31a288a4df7f6a28e65da22a4ab2add4a963738e", "versionType": "git"}, {"status": "affected", 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"https://git.kernel.org/stable/c/60aaccf16d1e099c16bebfb96428ae762cb528f7"}, {"url": "https://git.kernel.org/stable/c/b8ed41cc04fb74005aa51d17865ca3d022760335"}, {"url": "https://git.kernel.org/stable/c/31a288a4df7f6a28e65da22a4ab2add4a963738e"}, {"url": "https://git.kernel.org/stable/c/64e28ecf44e46de9f01915a4146706a21c3469d2"}, {"url": "https://git.kernel.org/stable/c/994e3e18908f5c4a12d07b44018e6aa85f071048"}, {"url": "https://git.kernel.org/stable/c/df5703348813235874d851934e957c3723d71644"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix potential user-after-free\n\nThis fixes all instances of which requires to allocate a buffer calling\nalloc_skb which may release the chan lock and reacquire later which\nmakes it possible that the chan is disconnected in the meantime."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": 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"semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.276", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.235", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.173", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.99", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.16", "versionType": "semver"}, {"lessThanOrEqual": "6.2.*", "status": "unaffected", "version": "6.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix potential user-after-free\n\nThis fixes all instances of which requires to allocate a buffer calling\nalloc_skb which may release the chan lock and reacquire later which\nmakes it possible that the chan is disconnected in the meantime."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Correcci\u00f3n de posible uso despu\u00e9s de liberaci\u00f3n\n\nEsto corrige todas las instancias de que requiere asignar un b\u00fafer llamando a alloc_skb, que puede liberar el bloqueo del canal y readquirirlo m\u00e1s tarde, lo que hace posible que el canal se desconecte mientras tanto."}], "id": "CVE-2023-54214", "lastModified": "2026-10-28T19:10:00.193", "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-2023-54214", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:39:26.318408Z", "version": "2.0.3"}}]}, "published": "2025-12-30T13:16:09.633", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/31a288a4df7f6a28e65da22a4ab2add4a963738e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/60aaccf16d1e099c16bebfb96428ae762cb528f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/64e28ecf44e46de9f01915a4146706a21c3469d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/994e3e18908f5c4a12d07b44018e6aa85f071048"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2fde8cb2a25125111f2144604e0e7c0ebcc4bba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8ed41cc04fb74005aa51d17865ca3d022760335"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df5703348813235874d851934e957c3723d71644"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: Bluetooth: L2CAP: Fix potential user-after-free", "id": "2426069", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2426069"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: L2CAP: Fix potential user-after-free\nThis fixes all instances of which requires to allocate a buffer calling\nalloc_skb which may release the chan lock and reacquire later which\nmakes it possible that the chan is disconnected in the meantime."], "name": "CVE-2023-54214", "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": "Not affected", "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": "2025-12-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-54214\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-54214\nhttps://lore.kernel.org/linux-cve-announce/2025123025-CVE-2023-54214-c4a6@gregkh/T"], "threat_severity": "Important"}

{}