CVE-2025-40255

{
  "id": "CVE-2025-40255",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-12-04T16:16:19.227",
  "lastModified": "2026-10-19T19:10:00.130",
  "vulnStatus": "Deferred",
  "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() ->\n  dev_get_hwtstamp_phylib() ->\n  vlan_hwtstamp_get() ->\n  generic_hwtstamp_get_lower() ->\n  generic_hwtstamp_ioctl_lower()\n\nresults in generic_hwtstamp_ioctl_lower() being called with\nkernel_cfg->ifr 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->ifr 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()  -> \n  dev_get_hwtstamp_phylib()  -> \n  vlan_hwtstamp_get()  -> \n  generic_hwtstamp_get_lower()  -> \n  generic_hwtstamp_ioctl_lower()\n\nresulta en generic_hwtstamp_ioctl_lower() siendo llamada con kernel_cfg -> ifr como NULL.\n\nLa función generic_hwtstamp_ioctl_lower() no espera un ifr NULL y lo desreferencia, llevando a una caída del sistema.\n\nSolucione esto añadiendo una comprobación de NULL para kernel_cfg -> ifr en generic_hwtstamp_ioctl_lower(). Si ifr es NULL, devuelva -EINVAL."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/core/dev_ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b",
              "lessThan": "8817f816ae41908e9625c0770c4af0dcdcc01238",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b",
              "lessThan": "f796a8dec9beafcc0f6f0d3478ed685a15c5e062",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/core/dev_ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.14",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.10",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8817f816ae41908e9625c0770c4af0dcdcc01238",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}