CVE-2026-90311 (GCVE-0-2026-90311)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
thermal: hwmon: Remove hwmon class device along with its parent
Summary
In the Linux kernel, the following vulnerability has been resolved: thermal: hwmon: Remove hwmon class device along with its parent The current code creates one hwmon device per thermal zone type and that device is registered under the first thermal zone of the given type. That turns out to be problematic when the thermal zone holding the hwmon device is removed. For example, say that there are two ACPI thermal zones on a system /sys/devices/virtual/thermal/thermal_zone0/ /sys/devices/virtual/thermal/thermal_zone1/ The current code registers a hwmon class device for thermal_zone0 only: /sys/devices/virtual/thermal/thermal_zone0/hwmon0/ because the type is "acpitz" for both of them, but it adds a sysfs attribute that belongs to thermal_zone1 under it: /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp2_input There is also /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input which belongs to thermal_zone0. When thermal_zone0 is removed, say because the ACPI thermal driver is unbound from the underlying platform device, thermal_remove_hwmon_sysfs() skips the removal of hwmon0 because of the temp2_input attribute belonging to thermal_zone1 which effectively prevents thermal_zone0 removal from making progress. Address this by making thermal_remove_hwmon_sysfs() remove the entire hwmon class device interface for the given thermal zone type when the thermal zone device holding it is removed. To prevent races with thermal_add_hwmon_sysfs() that may interfere with this, carry out the entire addition and removal of hwmon sysfs interfaces for thermal zones under thermal_hwmon_list_lock. Also adjust the layout of the labels in thermal_add_hwmon_sysfs() to the current kernel coding style to align with the new "unlock" label.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 , < 4fa8915f40f744c6db2a3c25b2ae7d2dd64c77b4 (git)
Affected: f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 , < 2b57e24d34b2dfc43c81942bb359d6315bf302fb (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/thermal/thermal_hwmon.c"
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              "versionType": "semver"
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "versionStartIncluding": "4.19",
                  "vulnerable": true
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: hwmon: Remove hwmon class device along with its parent\n\nThe current code creates one hwmon device per thermal zone type and that\ndevice is registered under the first thermal zone of the given type.\n\nThat turns out to be problematic when the thermal zone holding the\nhwmon device is removed.\n\nFor example, say that there are two ACPI thermal zones on a system\n\n /sys/devices/virtual/thermal/thermal_zone0/\n /sys/devices/virtual/thermal/thermal_zone1/\n\nThe current code registers a hwmon class device for thermal_zone0 only:\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/\n\nbecause the type is \"acpitz\" for both of them, but it adds a sysfs\nattribute that belongs to thermal_zone1 under it:\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp2_input\n\nThere is also\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input\n\nwhich belongs to thermal_zone0.\n\nWhen thermal_zone0 is removed, say because the ACPI thermal driver is\nunbound from the underlying platform device, thermal_remove_hwmon_sysfs()\nskips the removal of hwmon0 because of the temp2_input attribute\nbelonging to thermal_zone1 which effectively prevents thermal_zone0\nremoval from making progress.\n\nAddress this by making thermal_remove_hwmon_sysfs() remove the entire\nhwmon class device interface for the given thermal zone type when the\nthermal zone device holding it is removed.\n\nTo prevent races with thermal_add_hwmon_sysfs() that may interfere\nwith this, carry out the entire addition and removal of hwmon sysfs\ninterfaces for thermal zones under thermal_hwmon_list_lock.\n\nAlso adjust the layout of the labels in thermal_add_hwmon_sysfs() to\nthe current kernel coding style to align with the new \"unlock\" label."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:08:31.645Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4fa8915f40f744c6db2a3c25b2ae7d2dd64c77b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b57e24d34b2dfc43c81942bb359d6315bf302fb"
        }
      ],
      "title": "thermal: hwmon: Remove hwmon class device along with its parent",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90311",
    "datePublished": "2026-09-17T16:08:31.645Z",
    "dateReserved": "2026-09-11T19:38:34.800Z",
    "dateUpdated": "2026-09-17T16:08:31.645Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-25",
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      "percentile": "0.08484"
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                "product": "Linux",
                "programFiles": [
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                "product": "Linux",
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                ],
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                "vendor": "Linux",
                "versions": [
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: hwmon: Remove hwmon class device along with its parent\n\nThe current code creates one hwmon device per thermal zone type and that\ndevice is registered under the first thermal zone of the given type.\n\nThat turns out to be problematic when the thermal zone holding the\nhwmon device is removed.\n\nFor example, say that there are two ACPI thermal zones on a system\n\n /sys/devices/virtual/thermal/thermal_zone0/\n /sys/devices/virtual/thermal/thermal_zone1/\n\nThe current code registers a hwmon class device for thermal_zone0 only:\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/\n\nbecause the type is \"acpitz\" for both of them, but it adds a sysfs\nattribute that belongs to thermal_zone1 under it:\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp2_input\n\nThere is also\n\n /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input\n\nwhich belongs to thermal_zone0.\n\nWhen thermal_zone0 is removed, say because the ACPI thermal driver is\nunbound from the underlying platform device, thermal_remove_hwmon_sysfs()\nskips the removal of hwmon0 because of the temp2_input attribute\nbelonging to thermal_zone1 which effectively prevents thermal_zone0\nremoval from making progress.\n\nAddress this by making thermal_remove_hwmon_sysfs() remove the entire\nhwmon class device interface for the given thermal zone type when the\nthermal zone device holding it is removed.\n\nTo prevent races with thermal_add_hwmon_sysfs() that may interfere\nwith this, carry out the entire addition and removal of hwmon sysfs\ninterfaces for thermal zones under thermal_hwmon_list_lock.\n\nAlso adjust the layout of the labels in thermal_add_hwmon_sysfs() to\nthe current kernel coding style to align with the new \"unlock\" label."
          }
        ],
        "id": "CVE-2026-90311",
        "lastModified": "2026-09-17T17:17:28.870",
        "metrics": {},
        "published": "2026-09-17T17:17:28.870",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2b57e24d34b2dfc43c81942bb359d6315bf302fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4fa8915f40f744c6db2a3c25b2ae7d2dd64c77b4"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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