cve-2025-21637
Vulnerability from cvelistv5
Published
2025-01-19 10:17
Modified
2025-01-23 17:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: udp_port: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725
Impacted products
Vendor Product Version
Linux Linux Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
Version: 046c052b475e7119b6a30e3483e2888fc606a2f8
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   Linux Linux Version: 5.11
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0a0966312ac3eedd7f5f2a766ed4702df39a9a65",
              "status": "affected",
              "version": "046c052b475e7119b6a30e3483e2888fc606a2f8",
              "versionType": "git"
            },
            {
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              "versionType": "git"
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.125",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.72",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: udp_port: avoid using current-\u003ensproxy\n\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\nstructure via \u0027current\u0027 is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\n  from the opener\u0027s netns.\n\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata could also be used directly, but that would\nincrease the size of this fix, while \u0027sctp.ctl_sock\u0027 still needs to be\nretrieved from \u0027net\u0027 structure."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-01-23T17:01:19.967Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65"
        },
        {
          "url": "https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725"
        },
        {
          "url": "https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096"
        },
        {
          "url": "https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6"
        }
      ],
      "title": "sctp: sysctl: udp_port: avoid using current-\u003ensproxy",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21637",
    "datePublished": "2025-01-19T10:17:55.321Z",
    "dateReserved": "2024-12-29T08:45:45.726Z",
    "dateUpdated": "2025-01-23T17:01:19.967Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21637\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-01-19T11:15:09.217\",\"lastModified\":\"2025-01-23T17:15:25.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: sysctl: udp_port: avoid using current-\u003ensproxy\\n\\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\\nstructure via \u0027current\u0027 is not recommended for different reasons:\\n\\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\\n  from the opener\u0027s netns.\\n\\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\\n  syzbot [1] using acct(2).\\n\\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\\ncontainer_of().\\n\\nNote that table-\u003edata could also be used directly, but that would\\nincrease the size of this fix, while \u0027sctp.ctl_sock\u0027 still needs to be\\nretrieved from \u0027net\u0027 structure.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: udp_port: evitar usar current-\u0026gt;nsproxy Como se mencion\u00f3 en un commit anterior de esta serie, no se recomienda usar la estructura \u0027net\u0027 a trav\u00e9s de \u0027current\u0027 por diferentes razones: - Inconsistencia: obtener informaci\u00f3n de los netns del lector/escritor vs solo de los netns del abridor. - current-\u0026gt;nsproxy puede ser NULL en algunos casos, lo que resulta en un \u0027Oops\u0027 (null-ptr-deref), p. ej. cuando la tarea actual est\u00e1 saliendo, como lo detect\u00f3 syzbot [1] usando acct(2). La estructura \u0027net\u0027 se puede obtener de table-\u0026gt;data usando Container_of(). Tenga en cuenta que table-\u0026gt;data tambi\u00e9n se puede usar directamente, pero eso aumentar\u00eda el tama\u00f1o de esta correcci\u00f3n, mientras que \u0027sctp.ctl_sock\u0027 a\u00fan necesita ser recuperado de la estructura \u0027net\u0027.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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