CVE-2026-80696 (GCVE-0-2026-80696)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22
VLAI
Title
hwmon: (ltc4282) Fix reading the minimum alarm voltage
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Fix reading the minimum alarm voltage Coverity reports an out-of-bounds access when reading the minimum alarm voltage for the VGPIO channel. Add the missing return statement to fix the problem.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < 338d655fe09b95a88788c6ac8b1651ca8db9ae51 (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < 08aee6d45eefc9e0b94c21bd442f47b21d64fa2c (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < a0668ac20feaa3fff9e0c0548556368dbbd2d439 (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < 00feb1cce93dab948a299b69753d99c681d45a0b (git)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/ltc4282.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "cbc29538dbf7d7400f1ffc5dd5713e6a551463a0",
              "versionType": "git"
            },
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.9"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (ltc4282) Fix reading the minimum alarm voltage\n\nCoverity reports an out-of-bounds access when reading the minimum alarm\nvoltage for the VGPIO channel. Add the missing return statement to fix\nthe problem."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only by a local read(2) on /sys/class/hwmon/hwmonN/in2_min_alarm (sysfs -\u003e hwmon_attr_show -\u003e ltc4282_read -\u003e ltc4282_read_in); the LTC4282 I2C hwmon driver has no network, wireless, or direct physical-bus attack surface.\nAC:L - On systems with an LTC4282 bound, any read of in2_min_alarm deterministically executes the missing-return fallthrough and out-of-bounds in0_1_cache[2].en access; the attacker fully controls triggering with no race or conditions outside their control.\nPR:L - in2_min_alarm is exposed as mode 0444 with no capability checks beyond standard sysfs permissions, so any unprivileged local user on a host with LTC4282 hardware can invoke the vulnerable read path without init-namespace root or user-namespace privileges.\nUI:N - Exploitation requires only the attacker (or attacker-controlled monitoring software) to read the hwmon sysfs attribute; no separate victim action such as plugging hardware, mounting filesystems, or approving prompts is needed.\nS:U - The out-of-bounds read and conditional hardware alarm-bit clearing remain within the host kernel/driver context managing the local LTC4282; they do not cross VM, container, IOMMU, or other changed security-authority boundaries.\nC:H - The fallthrough indexes in0_1_cache[2] past the two-element array, performing an out-of-bounds read of adjacent ltc4282_state memory (energy_en/padding) that steers control flow and can return incorrect in2_min_alarm data to userspace.\nI:H - When the out-of-bounds .en byte is non-zero, the fallthrough calls __ltc4282_read_alarm() with VSOURCE_ALARM_L_MASK, clearing the VSOURCE undervoltage alarm bit on the live LTC4282 hot-swap controller and corrupting safety-critical power-rail monitoring on datacenter/telecom racks.\nA:H - Clearing VSOURCE undervoltage alarms on an LTC4282 controlling live backplane/linecard hot-swap power can mask critical rail faults, enabling undetected power events and sustained rack or linecard outages on affected server and industrial deployments."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:19.564Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/338d655fe09b95a88788c6ac8b1651ca8db9ae51"
        },
        {
          "url": "https://git.kernel.org/stable/c/08aee6d45eefc9e0b94c21bd442f47b21d64fa2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0668ac20feaa3fff9e0c0548556368dbbd2d439"
        },
        {
          "url": "https://git.kernel.org/stable/c/00feb1cce93dab948a299b69753d99c681d45a0b"
        }
      ],
      "title": "hwmon: (ltc4282) Fix reading the minimum alarm voltage",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80696",
    "datePublished": "2026-08-28T06:53:01.632Z",
    "dateReserved": "2026-08-26T14:34:25.785Z",
    "dateUpdated": "2026-08-29T06:22:19.564Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-08-28",
      "epss": "0.00168",
      "percentile": "0.06268"
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  }
}



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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.