264 lines
15 KiB
JSON
264 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-93165",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-17T16:02:15.090Z",
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"datePublished": "2026-09-17T16:11:57.922Z",
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"dateUpdated": "2026-10-19T09:06:37.145Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:06:37.145Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/chrome: sensorhub: Fix memory overread in ring handler\n\n`max_response` and `sensor_num` are read from different EC commands:\n\n- `max_response` is from cros_ec_get_proto_info().\n ec_dev->max_response = info->max_response_packet_size -\n sizeof(struct ec_host_response);\n\n- `sensor_num` is from cros_ec_get_sensor_count().\n sensor_num = cros_ec_get_sensor_count(ec);\n\nWith a malfunctioning EC firmware, it is possible that the `msg->insize`\n(i.e., `fifo_info_length` in the context) could be clamped in\ncros_ec_cmd_xfer() because `msg->insize` is greater than `max_response`.\n\n int fifo_info_length =\n sizeof(struct ec_response_motion_sense_fifo_info) +\n sizeof(u16) * sensorhub->sensor_num;\n\nThis means the number of read bytes could be less than expected. As a\nresult, the subsequent memcpy() in cros_ec_sensorhub_ring_handler()\noverreads the `resp->fifo_info` buffer.\n\nCheck the return value of cros_ec_cmd_xfer_status() and abort if the\nnumber of bytes read does not match the expected length."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.7,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The MOTIONSENSE_CMD_FIFO_INFO bytes that cros_ec_sensorhub_ring_handler() memcpy()s, plus the mismatched max_response (cros_ec_get_proto_info) and sensor_num (MOTIONSENSE_CMD_DUMP via cros_ec_get_sensor_count), arrive from the on-board Chrome EC through cros_ec_irq_thread → event_notifier → cros_ec_sensorhub_event, not from a network protocol or pluggable USB device.\nAC:L - A compromised EC sets dump.sensor_count and GET_PROTOCOL_INFO max_response_packet_size so fifo_info_length exceeds max_response, then sends EC_MKBP_EVENT_SENSOR_FIFO with total_lost != 0. cros_ec_cmd_xfer() clamps insize and the memcpy of fifo_info_length then runs deterministically with no race.\nPR:N - cros_ec_sensorhub_ring_handler() runs from the MKBP IRQ notifier with no capable() or credential check. cros_ec_sensorhub_ring_add() calls cros_ec_sensorhub_ring_fifo_enable(true) at probe, so compromised EC firmware can trigger the FIFO_INFO overread without a host account.\nUI:N - FIFO interrupts are armed in cros_ec_sensorhub_ring_add() during driver probe; the EC_MKBP_EVENT_SENSOR_FIFO IRQ alone reaches the memcpy. No victim must open an IIO device, the cros_ec chardev, or take any other action.\nS:U - The overread is of the host kernel heap object allocated for sensorhub->msg in cros_ec_sensorhub_probe(); impact stays in the same kernel that runs the sensorhub driver, not a VM, IOMMU, or sandbox boundary.\nC:H - After clamping, memcpy(fifo_info, &resp->fifo_info, fifo_info_length) reads past the max_response-sized msg->data allocation into adjacent slab. With dump.sensor_count up to 255 that is hundreds of bytes of kernel heap, and fifo_info->lost[] is later printed in the \"Sensor %d: lost: %d\" warning, not a few-byte leak.\nI:N - fifo_info is allocated fifo_info_length bytes in cros_ec_sensorhub_ring_allocate(), so the memcpy destination is in-bounds. fifo_info->count/size are then checked against fifo_size before MOTIONSENSE_CMD_FIFO_READ; this is an overread only, with no OOB write or control-flow hijack.\nA:H - memcpy() of fifo_info_length past the probe kmalloc (sizeof(cros_ec_command)+max_response) can walk off the slab into unmapped or poisoned memory and oops. A malicious EC can report a tiny max_response and large sensor_count to make that overread hundreds of bytes from a small object."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/chrome/cros_ec_sensorhub_ring.c"
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],
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"versions": [
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{
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"lessThan": "98604cc8fd2578442f49cd113481e8fc83bc0ad3",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"lessThan": "847a5ba0ac75f609e3f88da905251f7a76179145",
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"status": "affected",
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{
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"version": "145d59baff5944b71551ac518d7fd7d377a9c820",
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"lessThan": "6268f46d83875d294d75b68b97a5b79953744598",
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"status": "affected",
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"version": "145d59baff5944b71551ac518d7fd7d377a9c820",
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"lessThan": "d1ceb2b2324717fa30b44d56ef0c52813e239569",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/chrome/cros_ec_sensorhub_ring.c"
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],
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"versions": [
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{
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"version": "5.7",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.7",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7e901aaf95828364b05a2120a1bea1a1669bdc9a"
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{
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"url": "https://git.kernel.org/stable/c/7780d93ae28f31fe517417c9451255315d1ad584"
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},
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{
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"url": "https://git.kernel.org/stable/c/ee0403520cdbcf87e853df9aaa9b518a0684ed38"
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},
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{
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"url": "https://git.kernel.org/stable/c/847a5ba0ac75f609e3f88da905251f7a76179145"
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},
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{
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"url": "https://git.kernel.org/stable/c/6268f46d83875d294d75b68b97a5b79953744598"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1ceb2b2324717fa30b44d56ef0c52813e239569"
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}
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],
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"title": "platform/chrome: sensorhub: Fix memory overread in ring handler",
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} |