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CVE-2026-81017 (GCVE-0-2026-81017)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 11:59
VLAI
Title
platform/chrome: sensorhub: Bound the EC-reported sensor number
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.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 3a76b87e1d065183e2e7ae5b800cb1f6e84f543d (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 2b602ecf6193ecb9720c78b6728d7e09370b1ff1 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 324880f94ba3c6269a607e04f78a4dd4a66b3f53 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < d1b4add68dabfdd6481a4fa198bf3b473d2634d7 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 3d2636dce0a8fe9eecad29010699847be425dc80 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 5eaf7faa99578ae090030d1e2e6ea3b37a615496 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 4d9bf63ed74f859c6698bc01d8fb216ef9253867 (git)
Affected: 145d59baff5944b71551ac518d7fd7d377a9c820 , < 833740a2333c2e4db4e02e3d0ffba04e8718a5f3 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
            "drivers/platform/chrome/cros_ec_sensorhub_ring.c"
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              "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."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "platform/chrome: sensorhub: Bound the EC-reported sensor number",
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    "dateReserved": "2026-08-26T14:34:25.813Z",
    "dateUpdated": "2026-09-14T11:59:48.159Z",
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            "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."
          }
        ],
        "id": "CVE-2026-81017",
        "lastModified": "2026-09-14T13:18:55.973",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-11T20:19:10.680",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T21:28:10+00:00",
      "cve": "CVE-2026-81017",
      "id": "CVE-2026-81017",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/chrome: sensorhub: Bound the EC-reported sensor number",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81017.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:03:56Z",
      "cve": "CVE-2026-81017",
      "id": "CVE-2026-81017",
      "initial_release_date": "2026-09-12T16:35:26Z",
      "product_status:known_affected": "126",
      "product_status:known_not_affected": "227",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-81017",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-81017.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.