CVE-2025-21972 (GCVE-0-2025-21972)
Vulnerability from cvelistv5
Published
2025-04-01 15:47
Modified
2025-05-04 07:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mctp: unshare packets when reassembling Ensure that the frag_list used for reassembly isn't shared with other packets. This avoids incorrect reassembly when packets are cloned, and prevents a memory leak due to circular references between fragments and their skb_shared_info. The upcoming MCTP-over-USB driver uses skb_clone which can trigger the problem - other MCTP drivers don't share SKBs. A kunit test is added to reproduce the issue.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a992bbd365094730a31bae1e12a6ca695336d57
Version: 4a992bbd365094730a31bae1e12a6ca695336d57
Version: 4a992bbd365094730a31bae1e12a6ca695336d57
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mctp/route.c",
            "net/mctp/test/route-test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5c47d5bfa7b096cf8890afac32141c578583f8e0",
              "status": "affected",
              "version": "4a992bbd365094730a31bae1e12a6ca695336d57",
              "versionType": "git"
            },
            {
              "lessThan": "f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e",
              "status": "affected",
              "version": "4a992bbd365094730a31bae1e12a6ca695336d57",
              "versionType": "git"
            },
            {
              "lessThan": "f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc",
              "status": "affected",
              "version": "4a992bbd365094730a31bae1e12a6ca695336d57",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mctp/route.c",
            "net/mctp/test/route-test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.20",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.8",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: unshare packets when reassembling\n\nEnsure that the frag_list used for reassembly isn\u0027t shared with other\npackets. This avoids incorrect reassembly when packets are cloned, and\nprevents a memory leak due to circular references between fragments and\ntheir skb_shared_info.\n\nThe upcoming MCTP-over-USB driver uses skb_clone which can trigger the\nproblem - other MCTP drivers don\u0027t share SKBs.\n\nA kunit test is added to reproduce the issue."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:26:10.249Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc"
        }
      ],
      "title": "net: mctp: unshare packets when reassembling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21972",
    "datePublished": "2025-04-01T15:47:04.960Z",
    "dateReserved": "2024-12-29T08:45:45.797Z",
    "dateUpdated": "2025-05-04T07:26:10.249Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21972\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-01T16:15:28.540\",\"lastModified\":\"2025-04-01T20:26:01.990\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: mctp: unshare packets when reassembling\\n\\nEnsure that the frag_list used for reassembly isn\u0027t shared with other\\npackets. This avoids incorrect reassembly when packets are cloned, and\\nprevents a memory leak due to circular references between fragments and\\ntheir skb_shared_info.\\n\\nThe upcoming MCTP-over-USB driver uses skb_clone which can trigger the\\nproblem - other MCTP drivers don\u0027t share SKBs.\\n\\nA kunit test is added to reproduce the issue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mctp: paquetes no compartidos al reensamblar. Aseg\u00farese de que la lista de fragmentos utilizada para el reensamblado no se comparta con otros paquetes. Esto evita un reensamblado incorrecto al clonar paquetes y previene una fuga de memoria debido a referencias circulares entre fragmentos y su skb_shared_info. El pr\u00f3ximo controlador MCTP sobre USB utiliza skb_clone, lo que puede desencadenar el problema; otros controladores MCTP no comparten los SKB. Se ha a\u00f1adido una prueba kunit para reproducir el problema.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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