Vulnerability-Lookup

GHSA-856P-GWQH-FXCQ

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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

iio: adc: mt6359: fix unchecked return value in mt6358_read_imp

In mt6358_read_imp(), the variable val_v is passed to regmap_read() but the return value is not checked. If the read fails, val_v remains uninitialized and its random stack content is subsequently reported as a measurement result.

Initialize val_v to zero to ensure a predictable value is reported in case of bus failure and to prevent potential stack data leakage. This also satisfies static analyzers that might otherwise flag the variable as used uninitialized.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63936"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: mt6359: fix unchecked return value in mt6358_read_imp\n\nIn mt6358_read_imp(), the variable val_v is passed to regmap_read()\nbut the return value is not checked. If the read fails, val_v remains\nuninitialized and its random stack content is subsequently reported\nas a measurement result.\n\nInitialize val_v to zero to ensure a predictable value is reported\nin case of bus failure and to prevent potential stack data leakage.\nThis also satisfies static analyzers that might otherwise flag the\nvariable as used uninitialized.",
  "id": "GHSA-856p-gwqh-fxcq",
  "modified": "2026-07-19T18:31:47Z",
  "published": "2026-07-19T18:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63936"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6258bfec51e894ea97b8e69f3cde7af269b37de9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/944082fdb0284a31c0b37a88c8a1d4404da3a6d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a72f8e51d6ee66c255a8a93a4421b8a538d112a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9bbd943c34a9ad60e593a4b99ce2394e4e2381b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-63936 (GCVE-0-2026-63936)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55

Title

iio: adc: mt6359: fix unchecked return value in mt6358_read_imp

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: adc: mt6359: fix unchecked return value in mt6358_read_imp In mt6358_read_imp(), the variable val_v is passed to regmap_read() but the return value is not checked. If the read fails, val_v remains uninitialized and its random stack content is subsequently reported as a measurement result. Initialize val_v to zero to ensure a predictable value is reported in case of bus failure and to prevent potential stack data leakage. This also satisfies static analyzers that might otherwise flag the variable as used uninitialized.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6258bfec51e894ea9…
https://git.kernel.org/stable/c/944082fdb0284a31c…
https://git.kernel.org/stable/c/a72f8e51d6ee66c25…
https://git.kernel.org/stable/c/f9bbd943c34a9ad60…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3587914bf61df7924933530353d840378cdc4973 , < 6258bfec51e894ea97b8e69f3cde7af269b37de9 (git) Affected: 3587914bf61df7924933530353d840378cdc4973 , < 944082fdb0284a31c0b37a88c8a1d4404da3a6d9 (git) Affected: 3587914bf61df7924933530353d840378cdc4973 , < a72f8e51d6ee66c255a8a93a4421b8a538d112a8 (git) Affected: 3587914bf61df7924933530353d840378cdc4973 , < f9bbd943c34a9ad60e593a4b99ce2394e4e2381b (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/adc/mt6359-auxadc.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "3587914bf61df7924933530353d840378cdc4973",
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            },
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          "versions": [
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              "status": "unaffected",
              "version": "6.18.35",
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    "datePublished": "2026-07-19T14:55:33.942Z",
    "dateReserved": "2026-07-19T07:54:57.022Z",
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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.

Action not permitted

GHSA-856P-GWQH-FXCQ

CVE-2026-63936 (GCVE-0-2026-63936)

Tags

Sightings

Nomenclature