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CVE-2026-89936 (GCVE-0-2026-89936)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
VLAI
Title
iio: dac: m62332: Fix regulator reference count imbalance
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < bac0ed8bee651aa841375edf72c6ab1d10ac80c6 (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < 9263b9ad968a563337a60e0eb66e35186e1faf9a (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < 1d3a7d7dd3adee19e00be2b2237140f0fe169484 (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < f5acb824277a97a5210c454872202bf7f08c75d4 (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < ae18d2d2ef27a4d04fda6e30c23774513dc9be1e (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < 08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9 (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < 9fe22f563b2a0fdb11fd3711a8c39c023629c08a (git)
Affected: b87b0c0f81e8d11c881b726b886b7502ab67d884 , < a130404ce0b69ca1438126bd81c1985d3b4d2e6f (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.2"
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            {
              "lessThan": "4.2",
              "status": "unaffected",
              "version": "0",
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: dac: m62332: Fix regulator reference count imbalance\n\nm62332_set_value() enables the Vcc regulator on every write of a\nnon-zero value and disables it on every write of zero, without tracking\nthe channel\u0027s current state. Because the regulator is reference counted,\nchanging a channel directly from one non-zero value to another enables\nit more than once, while a later write of zero disables it only once.\nThe reference count never returns to zero and the regulator is left\nenabled indefinitely.\n\nOnly enable the regulator on the transition from zero to non-zero, and\nonly disable it on the transition from non-zero to zero, using the\npreviously stored channel value to detect the edge. Balance the\nregulator on the I2C error path so the reference count stays consistent\nif the write fails."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:32:25.608Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6"
        },
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          "url": "https://git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89936",
    "datePublished": "2026-09-16T10:32:25.608Z",
    "dateReserved": "2026-09-11T19:38:34.776Z",
    "dateUpdated": "2026-09-16T10:32:25.608Z",
    "state": "PUBLISHED"
  },
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Because the regulator is reference counted,\\nchanging a channel directly from one non-zero value to another enables\\nit more than once, while a later write of zero disables it only once.\\nThe reference count never returns to zero and the regulator is left\\nenabled indefinitely.\\n\\nOnly enable the regulator on the transition from zero to non-zero, and\\nonly disable it on the transition from non-zero to zero, using the\\npreviously stored channel value to detect the edge. 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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.

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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.
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  • 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.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.