CVE-2025-40363 (GCVE-0-2025-40363)
Vulnerability from cvelistv5
Published
2025-12-16 13:40
Modified
2025-12-16 13:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix field-spanning memcpy warning in AH output Fix field-spanning memcpy warnings in ah6_output() and ah6_output_done() where extension headers are copied to/from IPv6 address fields, triggering fortify-string warnings about writes beyond the 16-byte address fields. memcpy: detected field-spanning write (size 40) of single field "&top_iph->saddr" at net/ipv6/ah6.c:439 (size 16) WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439 The warnings are false positives as the extension headers are intentionally placed after the IPv6 header in memory. Fix by properly copying addresses and extension headers separately, and introduce helper functions to avoid code duplication.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: fix field-spanning memcpy warning in AH output\n\nFix field-spanning memcpy warnings in ah6_output() and\nah6_output_done() where extension headers are copied to/from IPv6\naddress fields, triggering fortify-string warnings about writes beyond\nthe 16-byte address fields.\n\n  memcpy: detected field-spanning write (size 40) of single field \"\u0026top_iph-\u003esaddr\" at net/ipv6/ah6.c:439 (size 16)\n  WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439\n\nThe warnings are false positives as the extension headers are\nintentionally placed after the IPv6 header in memory. Fix by properly\ncopying addresses and extension headers separately, and introduce\nhelper functions to avoid code duplication."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:40:03.265Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fec"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40363",
    "datePublished": "2025-12-16T13:40:03.265Z",
    "dateReserved": "2025-04-16T07:20:57.187Z",
    "dateUpdated": "2025-12-16T13:40:03.265Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40363\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:48.327\",\"lastModified\":\"2025-12-18T15:08:25.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ipv6: fix field-spanning memcpy warning in AH output\\n\\nFix field-spanning memcpy warnings in ah6_output() and\\nah6_output_done() where extension headers are copied to/from IPv6\\naddress fields, triggering fortify-string warnings about writes beyond\\nthe 16-byte address fields.\\n\\n  memcpy: detected field-spanning write (size 40) of single field \\\"\u0026top_iph-\u003esaddr\\\" at net/ipv6/ah6.c:439 (size 16)\\n  WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439\\n\\nThe warnings are false positives as the extension headers are\\nintentionally placed after the IPv6 header in memory. Fix by properly\\ncopying addresses and extension headers separately, and introduce\\nhelper functions to avoid code duplication.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0bf756ae1e69fec5e6332c37830488315d6d771b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2da805a61ef5272a2773775ce14c3650adb84248\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/75b16b2755e12999ad850756ddfb88ad4bfc7186\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9bf27de51bd6db5ff827780ec0eba55de230ba45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b056f971bd72b373b7ae2025a8f3bd18f69653d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c14cf41094136691c92ef756872570645d61f4a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f28dde240160f3c48a50d641d210ed6a3b9596ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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