FKIE_CVE-2025-40255

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2026-10-19 19:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower() The ethtool tsconfig Netlink path can trigger a null pointer dereference. A call chain such as: tsconfig_prepare_data() -> dev_get_hwtstamp_phylib() -> vlan_hwtstamp_get() -> generic_hwtstamp_get_lower() -> generic_hwtstamp_ioctl_lower() results in generic_hwtstamp_ioctl_lower() being called with kernel_cfg->ifr as NULL. The generic_hwtstamp_ioctl_lower() function does not expect a NULL ifr and dereferences it, leading to a system crash. Fix this by adding a NULL check for kernel_cfg->ifr in generic_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8817f816ae41908e9625c0770c4af0dcdcc01238
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev_ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8817f816ae41908e9625c0770c4af0dcdcc01238",
              "status": "affected",
              "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b",
              "versionType": "git"
            },
            {
              "lessThan": "f796a8dec9beafcc0f6f0d3478ed685a15c5e062",
              "status": "affected",
              "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev_ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.10",
              "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: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()\n\nThe ethtool tsconfig Netlink path can trigger a null pointer\ndereference. A call chain such as:\n\n  tsconfig_prepare_data() -\u003e\n  dev_get_hwtstamp_phylib() -\u003e\n  vlan_hwtstamp_get() -\u003e\n  generic_hwtstamp_get_lower() -\u003e\n  generic_hwtstamp_ioctl_lower()\n\nresults in generic_hwtstamp_ioctl_lower() being called with\nkernel_cfg-\u003eifr as NULL.\n\nThe generic_hwtstamp_ioctl_lower() function does not expect\na NULL ifr and dereferences it, leading to a system crash.\n\nFix this by adding a NULL check for kernel_cfg-\u003eifr in\ngeneric_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: core: prevenir desreferencia NULL en generic_hwtstamp_ioctl_lower()\n\nLa ruta Netlink ethtool tsconfig puede desencadenar una desreferencia de puntero nulo. Una cadena de llamadas como:\n\n  tsconfig_prepare_data()  -\u003e \n  dev_get_hwtstamp_phylib()  -\u003e \n  vlan_hwtstamp_get()  -\u003e \n  generic_hwtstamp_get_lower()  -\u003e \n  generic_hwtstamp_ioctl_lower()\n\nresulta en generic_hwtstamp_ioctl_lower() siendo llamada con kernel_cfg -\u003e ifr como NULL.\n\nLa funci\u00f3n generic_hwtstamp_ioctl_lower() no espera un ifr NULL y lo desreferencia, llevando a una ca\u00edda del sistema.\n\nSolucione esto a\u00f1adiendo una comprobaci\u00f3n de NULL para kernel_cfg -\u003e ifr en generic_hwtstamp_ioctl_lower(). Si ifr es NULL, devuelva -EINVAL."
    }
  ],
  "id": "CVE-2025-40255",
  "lastModified": "2026-10-19T19:10:00.130",
  "metrics": {},
  "published": "2025-12-04T16:16:19.227",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8817f816ae41908e9625c0770c4af0dcdcc01238"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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