fkie_cve-2025-21640
Vulnerability from fkie_nvd
Published
2025-01-19 11:15
Modified
2025-04-10 13:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03ca51faba2b017bf6c90e139434c4117d0afcdcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5599b212d2f4466e1832a94e9932684aaa364587
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13


To clipboard 

{
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    {
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: cookie_hmac_alg: 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, as this is the only\nmember needed from the \u0027net\u0027 structure, but that would increase the size\nof this fix, to use \u0027*data\u0027 everywhere \u0027net-\u003esctp.sctp_hmac_alg\u0027 is\nused."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: cookie_hmac_alg: 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), por ejemplo 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, ya que este es el \u00fanico miembro necesario de la estructura \u0027net\u0027, pero eso aumentar\u00eda el tama\u00f1o de esta correcci\u00f3n, para usar \u0027*data\u0027 en todos los lugares donde se use \u0027net-\u0026gt;sctp.sctp_hmac_alg\u0027."
    }
  ],
  "id": "CVE-2025-21640",
  "lastModified": "2025-04-10T13:15:46.927",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-01-19T11:15:09.537",
  "references": [
    {
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      "tags": [
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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