FKIE_CVE-2026-64238

Vulnerability from fkie_nvd - Published: 2026-07-24 16:16 - Updated: 2026-11-08 16:10
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: shared: fix deadlock on shared proxy's parent removal Commit 710abda58055 ("gpio: shared: call gpio_chip::of_xlate() if set") used the mutex embedded in struct gpio_shared_entry to protect the offset field which now can be modified after assignment. The critical section however is too wide and introduced a potential deadlock on the removal of the shared GPIO proxy's parent. Make the critical section shorter - only protect the offset when it's being read. While at it: mention the fact that the entry lock is now also used to protect against concurrent access to the offset field in the structure's documentation.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1b836607304f71051f9f9dcccf8b5097b86a1fbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a554dfcd30dd5e41d1d67387b3bb85cea83e12e1Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpiolib-shared.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a554dfcd30dd5e41d1d67387b3bb85cea83e12e1",
              "status": "affected",
              "version": "710abda58055ed5eaa8958107633cc12a365c328",
              "versionType": "git"
            },
            {
              "lessThan": "a1b836607304f71051f9f9dcccf8b5097b86a1fb",
              "status": "affected",
              "version": "710abda58055ed5eaa8958107633cc12a365c328",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "28f488e7b327630686378bb1d24e22cfc3fc162d",
              "versionType": "git"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.12",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpiolib-shared.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
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              "matchCriteriaId": "3E8EC0D8-1F19-40EC-8F9E-9E4FCF84758C",
              "versionEndExcluding": "7.0",
              "versionStartIncluding": "6.19.12",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B58924AD-439C-4E2B-A790-4A7874B3921B",
              "versionEndExcluding": "7.0.12",
              "versionStartIncluding": "7.0.1",
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              "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: shared: fix deadlock on shared proxy\u0027s parent removal\n\nCommit 710abda58055 (\"gpio: shared: call gpio_chip::of_xlate() if set\")\nused the mutex embedded in struct gpio_shared_entry to protect the\noffset field which now can be modified after assignment. The critical\nsection however is too wide and introduced a potential deadlock on the\nremoval of the shared GPIO proxy\u0027s parent.\n\nMake the critical section shorter - only protect the offset when it\u0027s\nbeing read.\n\nWhile at it: mention the fact that the entry lock is now also used to\nprotect against concurrent access to the offset field in the structure\u0027s\ndocumentation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ngpio: shared: corregir interbloqueo en la eliminaci\u00f3n del padre del proxy compartido\n\nEl commit 710abda58055 (\u2019gpio: shared: llamar a gpio_chip::of_xlate() si est\u00e1 configurado\u2019) us\u00f3 el mutex incrustado en la estructura gpio_shared_entry para proteger el campo offset, que ahora puede ser modificado despu\u00e9s de la asignaci\u00f3n. La secci\u00f3n cr\u00edtica, sin embargo, es demasiado amplia e introdujo un interbloqueo potencial en la eliminaci\u00f3n del padre del proxy GPIO compartido.\n\nHacer la secci\u00f3n cr\u00edtica m\u00e1s corta - solo proteger el offset cuando est\u00e1 siendo le\u00eddo.\n\nYa que estamos: mencionar el hecho de que el bloqueo de entrada ahora tambi\u00e9n se usa para proteger contra el acceso concurrente al campo offset en la documentaci\u00f3n de la estructura."
    }
  ],
  "id": "CVE-2026-64238",
  "lastModified": "2026-11-08T16:10:00.183",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-07-24T16:16:53.090",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a1b836607304f71051f9f9dcccf8b5097b86a1fb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/a554dfcd30dd5e41d1d67387b3bb85cea83e12e1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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