{"api_version":"1","generated_at":"2026-08-17T11:24:48+00:00","cve":"CVE-2026-74528","urls":{"html":"https://cve.report/CVE-2026-74528","api":"https://cve.report/api/cve/CVE-2026-74528.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74528","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74528"},"summary":{"title":"Bluetooth: hci_sync: hold conn in hci_past_sync() callback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:58","updated_at":"2026-08-17 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74528","cve":"CVE-2026-74528","epss":"0.001550000","percentile":"0.051960000","score_date":"2026-08-16","updated_at":"2026-08-17 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the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that."}],"metrics":[{"cvssV3_1":{"baseScore":8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - The bug is in Bluetooth LE PAST handling reached via ISO socket bind() rebind; exploitation requires an active LE connection to an adjacent peer and the freeing race is routinely won by concurrent local disconnects or a remote BLE link teardown, matching the CNA Bluetooth-adjacent threat model for phones and laptops in radio range.\nAC:L - An attacker controls both sides of the race by calling bind() to queue hci_past_sync() while concurrently closing the ISO socket or tearing down the looked-up LE link; repeated attempts can reliably free hci_conn objects before the hci_cmd_sync work callback runs without uncontrollable layout or timing dependencies.\nPR:L - Once the ISO socket layer is active (typically enabled by bluetoothd at boot), any unprivileged local user can open AF_BLUETOOTH SOCK_SEQPACKET ISO sockets and invoke the vulnerable bind() rebind path without CAP_NET_ADMIN; Bluetooth sockets are restricted to init_net and are not available through user namespaces.\nUI:N - Exploitation is driven entirely by the attacker's own socket operations and coordinated disconnects; no action by another user or administrator (pairing prompts, mounting, or opening files) is required beyond normal Bluetooth being enabled on the host.\nS:U - The use-after-free corrupts kernel heap objects and enables standard local kernel privilege escalation within the same security authority; it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Without refcounting, freed hci_conn pointers are passed to hci_conn_valid(); if kmalloc reuses the slab for another hci_conn the check can succeed and the callback reads handle, sync_handle, and iso_qos fields from attacker-influenced freed/reused memory, giving UAF-based kernel information disclosure.\nI:H - Slab reuse of the freed hci_conn lets an attacker shape heap contents so stale pointer dereferences and subsequent HCI PAST commands operate on attacker-controlled data, providing the memory corruption and arbitrary-write primitives typical of kernel use-after-free exploitation.\nA:H - Use-after-free on hci_conn structures in hci_cmd_sync work can cause KASAN slab-use-after-free reports, kernel oopses, or panics when freed memory is reused or corrupted, and misdirected PAST HCI commands can additionally disrupt or wedge Bluetooth connectivity on the host."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:17.804Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e6792adef614b389141b142e30ee549e4a47dd7d"},{"url":"https://git.kernel.org/stable/c/abf9753edf3f88282c44a605f3945d8d4f8dd86c"}],"title":"Bluetooth: hci_sync: hold conn in hci_past_sync() callback","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74528","datePublished":"2026-08-15T12:27:44.181Z","dateReserved":"2026-08-15T05:44:03.912Z","dateUpdated":"2026-08-17T05:48:17.804Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:58","lastModifiedDate":"2026-08-17 06:19:49","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.1,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74528","Ordinal":"1","Title":"Bluetooth: hci_sync: hold conn in hci_past_sync() callback","CVE":"CVE-2026-74528","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74528","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that.","Type":"Description","Title":"Bluetooth: hci_sync: hold conn in hci_past_sync() callback"}]}}}