{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-81017", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.813Z", "datePublished": "2026-09-11T19:43:05.409Z", "dateUpdated": "2026-10-19T08:46:42.592Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:42.592Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/chrome: sensorhub: Bound the EC-reported sensor number\n\nEach EC FIFO event carries an 8-bit sensor number (in->sensor_num).\ncros_ec_sensorhub_ring_handler() validates the FIFO event count, the\nper-read count and the ring bound, but not the sensor number, which\ncros_ec_sensor_ring_process_event() then uses unchecked to index\nsensorhub->batch_state[] - allocated with only sensorhub->sensor_num\nentries. A sensor number of sensor_num or larger is an out-of-bounds\nread and write of batch_state[].\n\nValidate the sensor number in the ring handler, where each event is read\nfrom the EC, and drop a malformed event before it is used." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The OOB is reached from the Chrome EC MKBP IRQ path (cros_ec_irq_thread → event_notifier → cros_ec_sensorhub_event → cros_ec_sensorhub_ring_handler) on an internally connected LPC/SPI/I2C/ISH coprocessor, not from network packets or a pluggable USB device.\nAC:L - A malicious or compromised EC fully controls each FIFO event’s sensor_num, flags, and timestamp from MOTIONSENSE_CMD_FIFO_READ. A non-timestamp event with sensor_num >= sensorhub->sensor_num deterministically indexes batch_state[] out of bounds with no race.\nPR:N - The FIFO handler runs from the EC IRQ notifier with no Linux capability or credential check, and interrupts are armed at probe via cros_ec_sensorhub_ring_fifo_enable(). Compromised EC firmware can deliver EC_MKBP_EVENT_SENSOR_FIFO events without a host account.\nUI:N - Sensor FIFO collection is enabled automatically at driver probe and proceeds on EC interrupts; no victim must open a device, mount a filesystem, or otherwise interact.\nS:U - The corruption is kernel heap in the same host OS that runs the sensorhub driver. This is ordinary kernel memory corruption, not a VM escape, IOMMU bypass, or other changed-scope boundary.\nC:H - Attacker-controlled 8-bit sensor_num indexes batch_state[] (allocated only for sensorhub->sensor_num entries), enabling an out-of-bounds read of adjacent heap via newest_sensor_event/last_ts. Unbounded OOB reads score Confidentiality High.\nI:H - ODR, FLUSH, and sample processing write last_len, penul_len, and newest_sensor_event at the attacker-chosen index, yielding a heap out-of-bounds write that can corrupt neighboring objects and hijack kernel control flow.\nA:H - Out-of-bounds heap access of batch_state[] can oops or panic the kernel when it hits unmapped or poisoned memory, so Availability is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/chrome/cros_ec_sensorhub_ring.c" ], "versions": [ { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "3a76b87e1d065183e2e7ae5b800cb1f6e84f543d", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "2b602ecf6193ecb9720c78b6728d7e09370b1ff1", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "324880f94ba3c6269a607e04f78a4dd4a66b3f53", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "d1b4add68dabfdd6481a4fa198bf3b473d2634d7", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "3d2636dce0a8fe9eecad29010699847be425dc80", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "5eaf7faa99578ae090030d1e2e6ea3b37a615496", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "4d9bf63ed74f859c6698bc01d8fb216ef9253867", "status": "affected", "versionType": "git" }, { "version": "145d59baff5944b71551ac518d7fd7d377a9c820", "lessThan": "833740a2333c2e4db4e02e3d0ffba04e8718a5f3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/chrome/cros_ec_sensorhub_ring.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3a76b87e1d065183e2e7ae5b800cb1f6e84f543d" }, { "url": "https://git.kernel.org/stable/c/2b602ecf6193ecb9720c78b6728d7e09370b1ff1" }, { "url": "https://git.kernel.org/stable/c/324880f94ba3c6269a607e04f78a4dd4a66b3f53" }, { "url": "https://git.kernel.org/stable/c/d1b4add68dabfdd6481a4fa198bf3b473d2634d7" }, { "url": "https://git.kernel.org/stable/c/3d2636dce0a8fe9eecad29010699847be425dc80" }, { "url": "https://git.kernel.org/stable/c/5eaf7faa99578ae090030d1e2e6ea3b37a615496" }, { "url": "https://git.kernel.org/stable/c/4d9bf63ed74f859c6698bc01d8fb216ef9253867" }, { "url": "https://git.kernel.org/stable/c/833740a2333c2e4db4e02e3d0ffba04e8718a5f3" } ], "title": "platform/chrome: sensorhub: Bound the EC-reported sensor number", "x_generator": { "engine": "bippy-1.2.0" } } } }