{"api_version":"1","generated_at":"2026-08-17T11:25:57+00:00","cve":"CVE-2026-74531","urls":{"html":"https://cve.report/CVE-2026-74531","api":"https://cve.report/api/cve/CVE-2026-74531.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74531","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74531"},"summary":{"title":"Bluetooth: hci_conn: hold conn reference in abort_conn_sync()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: hold conn reference in abort_conn_sync()\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\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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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74531","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 227a0cdf4a028a73dc256d0f5144b4808d718893 963fb4b8e7d1ab07b4ae45bf15d41e667c88caca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 227a0cdf4a028a73dc256d0f5144b4808d718893 e8f9fef362bab431d95371d3406bc720350290c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 227a0cdf4a028a73dc256d0f5144b4808d718893 fa812cfa81aa3d4a7b6ce8277979af57b3f79712 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: hold conn reference in abort_conn_sync()\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - The flaw is in the Bluetooth HCI connection abort path reachable when a nearby attacker sends connection, authentication-failure, or disconnect traffic that drives hci_disconnect()/hci_abort_conn() through hci_event processing.\nAC:L - An adjacent attacker can repeatedly initiate, fail, and tear down connections to race asynchronous abort_conn_sync work against hci_conn_del(), controlling both sides of the timing window without depending on uncontrollable system state.\nPR:N - Exploitation requires no local account or kernel privileges; a remote Bluetooth peer within RF range can trigger hci_abort_conn() via standard HCI event handling without authenticated pairing or CAP_NET_ADMIN access.\nUI:N - No deliberate victim action beyond normal Bluetooth availability is required; exploitation works against discoverable/connectable devices and already-paired reconnections without opening files or confirming a one-off prompt.\nS:U - Impact is kernel heap corruption and potential privilege escalation within the host kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - Use-after-free of struct hci_conn lets an attacker read freed slab memory through abort_conn_sync/hci_abort_conn_sync field accesses, enabling disclosure of kernel pointers and adjacent heap contents.\nI:H - UAF of hci_conn is heap memory corruption that can be shaped via slab reuse and exploited for arbitrary kernel writes or control-flow hijack, not merely a bounded data change.\nA:H - Accessing a freed hci_conn during abort_conn_sync can cause kernel oops, BUG, or panic, and UAF corruption can crash or hang the system even when full exploitation is not attempted."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:21.127Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6"},{"url":"https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca"},{"url":"https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3"},{"url":"https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712"},{"url":"https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5"}],"title":"Bluetooth: hci_conn: hold conn reference in abort_conn_sync()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74531","datePublished":"2026-08-15T12:27:45.988Z","dateReserved":"2026-08-15T05:44:03.912Z","dateUpdated":"2026-08-17T05:48:21.127Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:58","lastModifiedDate":"2026-08-17 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is\nrunning.\n\nHold refcount to avoid that.","Type":"Description","Title":"Bluetooth: hci_conn: hold conn reference in abort_conn_sync()"}]}}}