CVE-2025-40363 (GCVE-0-2025-40363)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:40 – Updated: 2026-06-16 19:57
VLAI
Title
net: ipv6: fix field-spanning memcpy warning in AH output
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:57 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2da805a61ef5272a2773775ce14c3650adb84248 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9bf27de51bd6db5ff827780ec0eba55de230ba45 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0bf756ae1e69fec5e6332c37830488315d6d771b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 75b16b2755e12999ad850756ddfb88ad4bfc7186 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f28dde240160f3c48a50d641d210ed6a3b9596ed (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c14cf41094136691c92ef756872570645d61f4a1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b056f971bd72b373b7ae2025a8f3bd18f69653d3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2327a3d6f65ce2fe2634546dde4a25ef52296fec (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 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: 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."
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: ipv6: corregir advertencia de memcpy que abarca campos en la salida AH\n\nCorrige las advertencias de memcpy que abarcan campos en ah6_output() y ah6_output_done() donde las cabeceras de extensi\u00f3n son copiadas a/desde campos de direcci\u00f3n IPv6, lo que activa advertencias de fortify-string sobre escrituras m\u00e1s all\u00e1 de los campos de direcci\u00f3n de 16 bytes.\n\nmemcpy: escritura que abarca campos detectada (tama\u00f1o 40) del campo \u00fanico \u0027\u0026top_iph -\u003e saddr\u0027 en net/ipv6/ah6.c:439 (tama\u00f1o 16)\nADVERTENCIA: CPU: 0 PID: 8838 en net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439\n\nLas advertencias son falsos positivos ya que las cabeceras de extensi\u00f3n se colocan intencionalmente despu\u00e9s de la cabecera IPv6 en memoria. Se corrige copiando correctamente las direcciones y las cabeceras de extensi\u00f3n por separado, e introduciendo funciones auxiliares para evitar la duplicaci\u00f3n de c\u00f3digo."
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      "current_release_date": "2026-06-30T02:59:41+00:00",
      "cve": "CVE-2025-40363",
      "id": "CVE-2025-40363",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ipv6: fix field-spanning memcpy warning in AH output",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40363.json",
      "version": "3"
    },
    "vulnrichment": {
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          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-40363",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T19:57:03.348828Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-16T19:57:07.940Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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            },
            {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.12"
                },
                {
                  "lessThan": "2.6.12",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.302",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.247",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.197",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.159",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.117",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.58",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.17.*",
                  "status": "unaffected",
                  "version": "6.17.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.18",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.302",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "5.10.247",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
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                    {
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                    {
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                    },
                    {
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                    },
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                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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          ],
          "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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:47:54.237Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
            {
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            {
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            },
            {
              "url": "https://git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fec"
            }
          ],
          "title": "net: ipv6: fix field-spanning memcpy warning in AH output",
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        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-40363",
        "datePublished": "2025-12-16T13:40:03.265Z",
        "dateReserved": "2025-04-16T07:20:57.187Z",
        "dateUpdated": "2026-06-16T19:57:11.691Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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