Vulnerability-Lookup

GHSA-MF77-WWF7-M2FF

Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-24 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (lm90) Add lock protection to lm90_alert

Sashiko reports:

lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock.

Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it.

If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register.

This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm.

Add the missing lock to lm90_alert() to solve the problem.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64213"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T16:16:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (lm90) Add lock protection to lm90_alert\n\nSashiko reports:\n\nlm90_alert() executes in the smbus alert context and calls\nlm90_update_confreg() to disable the hardware alert line, without\nacquiring hwmon_lock.\n\nConcurrently, sysfs write operations (such as lm90_write_convrate) hold\nthe hwmon_lock, temporarily modify data-\u003econfig, and then restore it.\n\nIf an alert interrupt occurs concurrently with a sysfs write, the sysfs\npath will overwrite the alert handler\u0027s modifications to data-\u003econfig\nand the hardware register.\n\nThis unintentionally re-enables the hardware alert line while the alarm is\nstill active, causing an interrupt storm.\n\nAdd the missing lock to lm90_alert() to solve the problem.",
  "id": "GHSA-mf77-wwf7-m2ff",
  "modified": "2026-07-24T18:31:27Z",
  "published": "2026-07-24T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64213"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64213 (GCVE-0-2026-64213)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-07-24 15:23

Title

hwmon: (lm90) Add lock protection to lm90_alert

Summary

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Add lock protection to lm90_alert Sashiko reports: lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock. Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it. If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register. This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm. Add the missing lock to lm90_alert() to solve the problem.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/bed1fc32e0eb65380…
https://git.kernel.org/stable/c/b0b66aae8a94c3663…
https://git.kernel.org/stable/c/873e919e3101063a7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f , < bed1fc32e0eb653806fa98afcf55f9a311fc4ce2 (git) Affected: 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f , < b0b66aae8a94c3663d47e4000b0e81b89ce32186 (git) Affected: 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f , < 873e919e3101063a7a75989510ccfc125a4391cf (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/lm90.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bed1fc32e0eb653806fa98afcf55f9a311fc4ce2",
              "status": "affected",
              "version": "7a1d220ccb0cc2b808eb176fb05bf55a38179f3f",
              "versionType": "git"
            },
            {
              "lessThan": "b0b66aae8a94c3663d47e4000b0e81b89ce32186",
              "status": "affected",
              "version": "7a1d220ccb0cc2b808eb176fb05bf55a38179f3f",
              "versionType": "git"
            },
            {
              "lessThan": "873e919e3101063a7a75989510ccfc125a4391cf",
              "status": "affected",
              "version": "7a1d220ccb0cc2b808eb176fb05bf55a38179f3f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/lm90.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (lm90) Add lock protection to lm90_alert\n\nSashiko reports:\n\nlm90_alert() executes in the smbus alert context and calls\nlm90_update_confreg() to disable the hardware alert line, without\nacquiring hwmon_lock.\n\nConcurrently, sysfs write operations (such as lm90_write_convrate) hold\nthe hwmon_lock, temporarily modify data-\u003econfig, and then restore it.\n\nIf an alert interrupt occurs concurrently with a sysfs write, the sysfs\npath will overwrite the alert handler\u0027s modifications to data-\u003econfig\nand the hardware register.\n\nThis unintentionally re-enables the hardware alert line while the alarm is\nstill active, causing an interrupt storm.\n\nAdd the missing lock to lm90_alert() to solve the problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-24T15:23:02.987Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186"
        },
        {
          "url": "https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf"
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      ],
      "title": "hwmon: (lm90) Add lock protection to lm90_alert",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64213",
    "datePublished": "2026-07-24T15:23:02.987Z",
    "dateReserved": "2026-07-19T15:36:31.770Z",
    "dateUpdated": "2026-07-24T15:23:02.987Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-MF77-WWF7-M2FF

CVE-2026-64213 (GCVE-0-2026-64213)

Tags

Sightings

Nomenclature