FKIE_CVE-2025-40239

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2026-06-17 09:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/micrel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "da1ef8e9eb5d4a12bec32d11636e521e7d529b9e",
              "status": "affected",
              "version": "b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746",
              "versionType": "git"
            },
            {
              "lessThan": "b093b06826b836c2824858669db080c190c04715",
              "status": "affected",
              "version": "b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746",
              "versionType": "git"
            },
            {
              "lessThan": "399d10934740ae8cdaa4e3245f7c5f6c332da844",
              "status": "affected",
              "version": "b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/micrel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "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\nnet: phy: micrel: always set shared-\u003ephydev for LAN8814\n\nCurrently, during the LAN8814 PTP probe shared-\u003ephydev is only set if PTP\nclock gets actually set, otherwise the function will return before setting\nit.\n\nThis is an issue as shared-\u003ephydev is unconditionally being used when IRQ\nis being handled, especially in lan8814_gpio_process_cap and since it was\nnot set it will cause a NULL pointer exception and crash the kernel.\n\nSo, simply always set shared-\u003ephydev to avoid the NULL pointer exception."
    }
  ],
  "id": "CVE-2025-40239",
  "lastModified": "2026-06-17T09:21:30.623",
  "metrics": {},
  "published": "2025-12-04T16:16:16.963",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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