FKIE_CVE-2026-64213

Vulnerability from fkie_nvd - Published: 2026-07-24 16:16 - Updated: 2026-07-30 14:59
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-64213",
  "lastModified": "2026-07-30T14:59:47.950",
  "metrics": {},
  "published": "2026-07-24T16:16:48.950",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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