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iio: dac: m62332: Fix regulator reference count imbalance

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: iio: dac: m62332: Fix regulator reference count imbalance m62332_set_value() enables the Vcc regulator on every write of a non-zero value and disables it on every write of zero, without tracking the channel's current state. Because the regulator is reference counted, changing a channel directly from one non-zero value to another enables it more than once, while a later write of zero disables it only once. The reference count never returns to zero and the regulator is left enabled indefinitely. Only enable the regulator on the transition from zero to non-zero, and only disable it on the transition from non-zero to zero, using the previously stored channel value to detect the edge. Balance the regulator on the I2C error path so the reference count stays consistent if the write fails.

Announced Source revision 1
Original source ↗

CVE-2026-89936

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89936

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "bac0ed8bee651aa841375edf72c6ab1d10ac80c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "9263b9ad968a563337a60e0eb66e35186e1faf9a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "1d3a7d7dd3adee19e00be2b2237140f0fe169484",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "f5acb824277a97a5210c454872202bf7f08c75d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "ae18d2d2ef27a4d04fda6e30c23774513dc9be1e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "9fe22f563b2a0fdb11fd3711a8c39c023629c08a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b87b0c0f81e8d11c881b726b886b7502ab67d884",
        "lessThan": "a130404ce0b69ca1438126bd81c1985d3b4d2e6f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/iio/dac/m62332.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/iio/dac/m62332.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89936

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36378 · Revision 1
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Publisher date
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