{"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":"2026-09-14T11:59:48.159Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-14T11:59:48.159Z"},"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-rc1","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-rc1"}]}]}],"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"}}}}