CVE-2025-40255 (GCVE-0-2025-40255)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2025-12-04 16:08
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6e9e2eed4f39d52edf5fd006409d211facf49f6b , < 8817f816ae41908e9625c0770c4af0dcdcc01238 (git)
Affected: 6e9e2eed4f39d52edf5fd006409d211facf49f6b , < f796a8dec9beafcc0f6f0d3478ed685a15c5e062 (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T16:08:17.023Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062"
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      ],
      "title": "net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40255",
    "datePublished": "2025-12-04T16:08:17.023Z",
    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2025-12-04T16:08:17.023Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40255\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:19.227\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"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\"}]}}"
  }
}


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