CVE-2026-81017 (GCVE-0-2026-81017)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:46
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/chrome: sensorhub: Bound the EC-reported sensor number Each EC FIFO event carries an 8-bit sensor number (in->sensor_num). cros_ec_sensorhub_ring_handler() validates the FIFO event count, the per-read count and the ring bound, but not the sensor number, which cros_ec_sensor_ring_process_event() then uses unchecked to index sensorhub->batch_state[] - allocated with only sensorhub->sensor_num entries. A sensor number of sensor_num or larger is an out-of-bounds read and write of batch_state[]. Validate the sensor number in the ring handler, where each event is read from the EC, and drop a malformed event before it is used.
References
Impacted products
Vendor Product Version
Linux Linux Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
Version: 145d59baff5944b71551ac518d7fd7d377a9c820
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/chrome/cros_ec_sensorhub_ring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/chrome/cros_ec_sensorhub_ring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003esensor_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-\u003ebatch_state[] - allocated with only sensorhub-\u003esensor_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": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The OOB is reached from the Chrome EC MKBP IRQ path (cros_ec_irq_thread \u2192 event_notifier \u2192 cros_ec_sensorhub_event \u2192 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\u2019s sensor_num, flags, and timestamp from MOTIONSENSE_CMD_FIFO_READ. A non-timestamp event with sensor_num \u003e= sensorhub-\u003esensor_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-\u003esensor_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:42.592Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81017",
    "datePublished": "2026-09-11T19:43:05.409Z",
    "dateReserved": "2026-08-26T14:34:25.813Z",
    "dateUpdated": "2026-10-19T08:46:42.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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