{"api_version":"1","generated_at":"2026-08-29T12:13:42+00:00","cve":"CVE-2026-80721","urls":{"html":"https://cve.report/CVE-2026-80721","api":"https://cve.report/api/cve/CVE-2026-80721.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80721","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80721"},"summary":{"title":"Bluetooth: ISO: ensure no dangling hcon references in iso_conn","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: ensure no dangling hcon references in iso_conn\n\nAfter iso_conn_del(), ISO sockets should not dereference the hcon any\nmore.  Currently, clearing iso_conn::hcon relies on iso_conn_del()\nreleasing the last reference to the iso_conn.\n\nSimplify this by explicitly clearing conn->hcon in iso_conn_del(), to\navoid more complex reasoning on races about who holds the last\nreference.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:57","updated_at":"2026-08-29 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the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: ensure no dangling hcon references in iso_conn\n\nAfter iso_conn_del(), ISO sockets should not dereference the hcon any\nmore.  Currently, clearing iso_conn::hcon relies on iso_conn_del()\nreleasing the last reference to the iso_conn.\n\nSimplify this by explicitly clearing conn->hcon in iso_conn_del(), to\navoid more complex reasoning on races about who holds the last\nreference."}],"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 bug is in Bluetooth ISO connection teardown (iso_conn_del/iso_conn_free); reachable when an adjacent peer triggers HCI disconnect/connect-failure events or sends ISO traffic processed by iso_recv, without network or physical USB access.\nAC:L - An adjacent attacker controls both sides of the refcount race by timing remote disconnects and ISO packets against local teardown; no rare layout or victim-specific state beyond an active ISO session is required.\nPR:N - No local privileges are required on the victim; an unauthenticated adjacent Bluetooth peer can trigger iso_disconn_cfm/iso_connect_cfm teardown on phones and desktops with Bluetooth and LE Audio/ISO enabled.\nUI:N - Exploitation needs no victim interaction during the attack; once Bluetooth is on and an ISO link exists (e.g., LE Audio), remote disconnect and ISO traffic alone can hit the race.\nS:U - The flaw causes kernel heap use-after-free on hci_conn via dangling iso_conn::hcon references; impact stays within kernel memory safety, not a VM escape or cross-authority boundary.\nC:H - After hci_conn_del frees hcon, iso_conn still holds conn->hcon; subsequent iso_conn_free or socket paths dereference freed hci_conn memory, a classic UAF read primitive.\nI:H - Use-after-free on hci_conn enables corrupting connection management fields and hci_conn_drop state; such kernel heap UAF bugs are routinely leveraged for arbitrary write and code execution.\nA:H - Dereferencing freed hci_conn in iso_conn_free or ISO socket teardown reliably causes kernel oops or panic, giving unprivileged adjacent attackers a repeatable denial-of-service."}]}],"providerMetadata":{"dateUpdated":"2026-08-29T06:22:37.048Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e941799c31f68e67ce0976efb38a79101f921b64"},{"url":"https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec"},{"url":"https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb"}],"title":"Bluetooth: ISO: ensure no dangling hcon references in iso_conn","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80721","datePublished":"2026-08-28T06:53:17.278Z","dateReserved":"2026-08-26T14:34:25.788Z","dateUpdated":"2026-08-29T06:22:37.048Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:57","lastModifiedDate":"2026-08-29 07:16:53","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:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80721","Ordinal":"1","Title":"Bluetooth: ISO: ensure no dangling hcon references in iso_conn","CVE":"CVE-2026-80721","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80721","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: ensure no dangling hcon references in iso_conn\n\nAfter iso_conn_del(), ISO sockets should not dereference the hcon any\nmore.  Currently, clearing iso_conn::hcon relies on iso_conn_del()\nreleasing the last reference to the iso_conn.\n\nSimplify this by explicitly clearing conn->hcon in iso_conn_del(), to\navoid more complex reasoning on races about who holds the last\nreference.","Type":"Description","Title":"Bluetooth: ISO: ensure no dangling hcon references in iso_conn"}]}}}