CVE-2026-31771

{"id": "CVE-2026-31771", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31771", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:13:04.391952Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "fbea63d0d301edd4a42f4390b49b8519d78b802d", "versionType": "git"}, {"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "1e4b738dd0d0f7b237686167706badad9d30649c", "versionType": "git"}, {"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "ac7889b0fe441e4ef892c40b1d002e91f93fa4ae", "versionType": "git"}, {"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "dbc8b8d33c9e19e17e8b8b1361bbb46e2983f5f2", "versionType": "git"}, {"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "86c8d07a64d553c41e213b52650020010f9ef23e", "versionType": "git"}, {"status": "affected", "version": "2f20216c1d6fe17c1a224f658be0dc6fab2269c7", "lessThan": "2b2bf47cd75518c36fa2d41380e4a40641cc89cd", "versionType": "git"}], "programFiles": ["net/bluetooth/hci_event.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.114", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.57", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/hci_event.c"], "defaultStatus": "affected"}]}], "published": "2026-05-01T15:16:40.337", "references": [{"url": "https://git.kernel.org/stable/c/1e4b738dd0d0f7b237686167706badad9d30649c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2b2bf47cd75518c36fa2d41380e4a40641cc89cd", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/86c8d07a64d553c41e213b52650020010f9ef23e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ac7889b0fe441e4ef892c40b1d002e91f93fa4ae", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dbc8b8d33c9e19e17e8b8b1361bbb46e2983f5f2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fbea63d0d301edd4a42f4390b49b8519d78b802d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: move wake reason storage into validated event handlers\n\nhci_store_wake_reason() is called from hci_event_packet() immediately\nafter stripping the HCI event header but before hci_event_func()\nenforces the per-event minimum payload length from hci_ev_table.\nThis means a short HCI event frame can reach bacpy() before any bounds\ncheck runs.\n\nRather than duplicating skb parsing and per-event length checks inside\nhci_store_wake_reason(), move wake-address storage into the individual\nevent handlers after their existing event-length validation has\nsucceeded. Convert hci_store_wake_reason() into a small helper that only\nstores an already-validated bdaddr while the caller holds hci_dev_lock().\nUse the same helper after hci_event_func() with a NULL address to\npreserve the existing unexpected-wake fallback semantics when no\nvalidated event handler records a wake address.\n\nAnnotate the helper with __must_hold(&hdev->lock) and add\nlockdep_assert_held(&hdev->lock) so future call paths keep the lock\ncontract explicit.\n\nCall the helper from hci_conn_request_evt(), hci_conn_complete_evt(),\nhci_sync_conn_complete_evt(), le_conn_complete_evt(),\nhci_le_adv_report_evt(), hci_le_ext_adv_report_evt(),\nhci_le_direct_adv_report_evt(), hci_le_pa_sync_established_evt(), and\nhci_le_past_received_evt()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_event: mover el almacenamiento del motivo de activaci\u00f3n a los gestores de eventos validados\n\nhci_store_wake_reason() es llamada desde hci_event_packet() inmediatamente despu\u00e9s de eliminar la cabecera del evento HCI pero antes de que hci_event_func() imponga la longitud m\u00ednima de carga \u00fatil por evento de hci_ev_table. Esto significa que una trama de evento HCI corta puede alcanzar bacpy() antes de que se ejecute cualquier comprobaci\u00f3n de l\u00edmites.\n\nEn lugar de duplicar el an\u00e1lisis de skb y las comprobaciones de longitud por evento dentro de hci_store_wake_reason(), mover el almacenamiento de la direcci\u00f3n de activaci\u00f3n a los gestores de eventos individuales despu\u00e9s de que su validaci\u00f3n de longitud de evento existente haya tenido \u00e9xito. Convertir hci_store_wake_reason() en una peque\u00f1a funci\u00f3n auxiliar que solo almacena una bdaddr ya validada mientras el llamador mantiene hci_dev_lock(). Usar la misma funci\u00f3n auxiliar despu\u00e9s de hci_event_func() con una direcci\u00f3n NULL para preservar la sem\u00e1ntica de reserva de activaci\u00f3n inesperada existente cuando ning\u00fan gestor de eventos validado registra una direcci\u00f3n de activaci\u00f3n.\n\nAnotar la funci\u00f3n auxiliar con __must_hold(&hdev -> lock) y a\u00f1adir lockdep_assert_held(&hdev -> lock) para que las futuras rutas de llamada mantengan expl\u00edcito el contrato de bloqueo.\n\nLlamar a la funci\u00f3n auxiliar desde hci_conn_request_evt(), hci_conn_complete_evt(), hci_sync_conn_complete_evt(), le_conn_complete_evt(), hci_le_adv_report_evt(), hci_le_ext_adv_report_evt(), hci_le_direct_adv_report_evt(), hci_le_pa_sync_established_evt(), y hci_le_past_received_evt()."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5C6630F4-82C7-43EE-A9AC-FF59BBAEEDD1", "versionEndExcluding": "6.19.12", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}