{"api_version":"1","generated_at":"2026-07-10T14:37:13+00:00","cve":"CVE-2026-53276","urls":{"html":"https://cve.report/CVE-2026-53276","api":"https://cve.report/api/cve/CVE-2026-53276.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53276","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53276"},"summary":{"title":"Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix a use-after-free of the hci_conn pointer\n\nIn iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is\ndropped:\n\tbis = iso_pi(sk)->conn->hcon;\n\t/* Release the socket before lookups since that requires hci_dev_lock\n\t * which shall not be acquired while holding sock_lock for proper\n\t * ordering.\n\t */\n\trelease_sock(sk);\n\thci_dev_lock(bis->hdev);\n\nDuring the unlocked window, could a concurrent close() destroy the connection\nand free the bis structure, causing hci_dev_lock(bis->hdev) to access memory\nafter it is freed, fix this by using the hdev reference which was safely\nacquired via iso_conn_get_hdev().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:45","updated_at":"2026-07-08 04:00:13"},"problem_types":["CWE-416"],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/d324b8aa20bd3c3394e3647dc22491d88f3f4e7a","name":"https://git.kernel.org/stable/c/d324b8aa20bd3c3394e3647dc22491d88f3f4e7a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322","name":"https://git.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53276","name":"CVE 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the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix a use-after-free of the hci_conn pointer\n\nIn iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is\ndropped:\n\tbis = iso_pi(sk)->conn->hcon;\n\t/* Release the socket before lookups since that requires hci_dev_lock\n\t * which shall not be acquired while holding sock_lock for proper\n\t * ordering.\n\t */\n\trelease_sock(sk);\n\thci_dev_lock(bis->hdev);\n\nDuring the unlocked window, could a concurrent close() destroy the connection\nand free the bis structure, causing hci_dev_lock(bis->hdev) to access memory\nafter it is freed, fix this by using the hdev reference which was safely\nacquired via iso_conn_get_hdev()."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-06-28T06:41:19.460Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d324b8aa20bd3c3394e3647dc22491d88f3f4e7a"},{"url":"https://git.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322"}],"title":"Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53276","datePublished":"2026-06-25T08:39:59.804Z","dateReserved":"2026-06-09T07:44:35.395Z","dateUpdated":"2026-06-28T06:41:19.460Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:45","lastModifiedDate":"2026-07-08 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ISO: Fix a use-after-free of the hci_conn pointer","CVE":"CVE-2026-53276","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53276","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix a use-after-free of the hci_conn pointer\n\nIn iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is\ndropped:\n\tbis = iso_pi(sk)->conn->hcon;\n\t/* Release the socket before lookups since that requires hci_dev_lock\n\t * which shall not be acquired while holding sock_lock for proper\n\t * ordering.\n\t */\n\trelease_sock(sk);\n\thci_dev_lock(bis->hdev);\n\nDuring the unlocked window, could a concurrent close() destroy the connection\nand free the bis structure, causing hci_dev_lock(bis->hdev) to access memory\nafter it is freed, fix this by using the hdev reference which was safely\nacquired via iso_conn_get_hdev().","Type":"Description","Title":"Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer"}]}}}