{"metadata": {"vulnerability": "CVE-2026-19676", "count": 10, "kinds": {"milestone": 3, "sighting": 1, "kev": 0, "other": 6}, "linked_omitted": 0}, "data": [{"timestamp": "2026-08-12T22:25:11.381Z", "date_only": false, "value": "2026-08-12T22:25:11.381Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-21T18:19:27.767Z", "date_only": false, "value": "2026-10-21T18:19:27.767Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-21T19:17:02.650Z", "date_only": false, "value": "2026-10-21T19:17:02.650", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19676", "record": "FKIE_CVE-2026-19676", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-21T20:04:27.097Z", "date_only": false, "value": "2026-10-21T20:04:27.097763Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117480689926250635", "record": "CVE-2026-19676", "field": "creation_timestamp", "uuid": "6a8e8fdf-13e8-407d-9217-3b987666dd3a", "content": "CVE-2026-19676 PECI transfer syscall verifier does not validate embedded user buffer pointers, allowing arbitrary kernel memory read/write from user mode The user-mode verifier for the peci_transfer() system call, z_vrfy_peci_transfer() in drivers/peci/peci_handlers.c, checked only the device object permission and copied the caller-supplied struct peci_msg with k_usermode_from_copy(). That copy validates the outer structure only; the buf pointers and len values inside the embedded struct peci_buf members tx_buffer and rx_buffer remained fully caller-controlled and were passed unchecked to the driver.\nEvery in-tree PECI driver dereferences those pointers in supervisor mode: peci_npcx_transfer() in drivers/peci/peci_npcx.c and peci_it8xxx2_transfer() in drivers/peci/peci_ite_it8xxx2.c copy hardware bytes into rx_buffer.buf[i] and read command bytes out of tx_buffer.buf[i], and peci_xec_read()/peci_xec_write() in drivers/peci/peci_mchp_xec.c do the same with no bound on rx_buffer.len at all. A user-mode thread that has been granted the PECI device object \u2014 the normal way an application exposes a device under CONFIG_USERSPACE \u2014 could therefore point rx_buffer.buf at kernel data structures and have the driver write hardware-supplied bytes there, or point tx_buffer.buf at kernel memory and have its contents pushed onto the PECI/eSPI out-of-band bus.\nThe impact is a full user-mode-to-kernel escape: an arbitrary kernel write primitive (integrity and, through it, code execution at supervisor privilege), an arbitrary kernel read disclosed to a PECI bus observer, and a trivially reachable supervisor-mode fault if an unmapped address is supplied. Exploitation requires CONFIG_USERSPACE=y, one of the PECI drivers enabled (CONFIG_PECI_NPCX, CONFIG_PECI_XEC or CONFIG_PECI_ITE_IT8XXX2), and local code execution in a user-mode thread holding the PECI device.\nThe fix adds K_SYSCALL_MEMORY_READ() and K_SYSCALL_MEMORY_WRITE() checks over the two embedded buffers, with a size_add_overflow() guard on the frame-check-sequence byte accounted for in the RX length.\nhttps://www.cve.org/CVERecord?id=CVE-2026-19676https://github.com/zephyrproject-rtos/zephyr/commit/d7faf323d52b7e8845a63b1f854a82bdda44c261https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g66q-frxm-3hfg#zephyrproject #zephyr#CVE_2026_19676#bot", "url": "https://infosec.exchange/users/cve/statuses/117480689926250635"}, {"timestamp": "2026-10-23T20:45:36.561Z", "date_only": false, "value": "2026-10-23T20:45:36.561871Z", "kind": "other", "label": "Recorded", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-19676", "field": "containers.adp.0.metrics.0.other.content.timestamp"}, {"timestamp": "2026-10-23T20:45:36.561Z", "date_only": false, "value": "2026-10-23T20:45:36.561871Z", "kind": "other", "label": "Recorded", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19676", "record": "FKIE_CVE-2026-19676", "field": "metrics.ssvcV203.0.ssvcData.timestamp", "linked_record": true}, {"timestamp": "2026-10-23T21:57:28.879Z", "date_only": false, "value": "2026-10-23T21:57:28.879Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-19676", "field": "containers.adp.0.providerMetadata.dateUpdated"}, {"timestamp": "2026-11-04T05:01:13.935Z", "date_only": false, "value": "2026-11-04T05:01:13.935Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-11-04T05:01:13.935Z", "date_only": false, "value": "2026-11-04T05:01:13.935Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / zephyr", "record": "CVE-2026-19676", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-11-04T05:18:49.827Z", "date_only": false, "value": "2026-11-04T05:18:49.827", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19676", "record": "FKIE_CVE-2026-19676", "field": "lastModified", "linked_record": true}], "metrics": {"as_of": "2026-11-12T04:22:38.748Z", "anchors": {"origin": {"timestamp": "2026-10-21T18:19:27.767Z", "date_only": false, "value": "2026-10-21T18:19:27.767Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "discovery": null, "report": null, "acknowledgement": null, "disclosure": {"timestamp": "2026-10-21T18:19:27.767Z", "date_only": false, "value": "2026-10-21T18:19:27.767Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "exploit_publication": null, "exploitation": null, "patch": null}, "vendor_response_time": {"available": false, "missing": ["start", "end"]}, "time_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit_publication": {"available": false, "missing": ["end"]}, "time_to_patch": {"available": false, "missing": ["start", "end"]}, "total_time_to_patch": {"available": false, "missing": ["start", "end"]}, "disclosure_to_patch": {"available": false, "missing": ["end"]}, "time_unpatched": {"available": true, "seconds": 1850590.981627, "hours": 514.0530504519445, "days": 21.418877102164352, "min_seconds": 1850590.981627, "max_seconds": 1850590.981627, "approximate": false, "ongoing": true, "order_known": true, "batch_listing": false, "end_before_start": false, "start": {"timestamp": "2026-10-21T18:19:27.767Z", "date_only": false, "value": "2026-10-21T18:19:27.767Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19676", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "end": {"timestamp": "2026-11-12T04:22:38.748Z", "date_only": false, "label": "As of", "source": "Calculation clock"}}, "exploitation_to_patch": {"available": false, "missing": ["start"]}, "exploit_publication_to_patch": {"available": false, "missing": ["start"]}}}