{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-21638",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21638",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-01-19T10:17:56.084Z",
    "updatedAt": "2026-10-15T21:51:51.834Z",
    "importedAt": "2026-10-24T01:57:29.455Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "sctp: sysctl: auth_enable: avoid using current->nsproxy",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, but that would\nincrease the size of this fix, while 'sctp.ctl_sock' still needs to be\nretrieved from 'net' structure.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cf387cdebfaebae228dfba162f94c567a67610c3"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dc583e7e5f8515ca489c0df28e4362a70eade382"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bd2a2939423566c654545fa3e96a656662a0af9e"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1b67030d39f2b00f94ac1f0af11ba6657589e4d3"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c184bc621e3cef03ac9ba81a50dda2dae6a21d36"
            },
            {
              "version": "b14878ccb7fac0242db82720b784ab62c467c0dc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "15649fd5415eda664ef35780c2013adeb5d9c695"
            },
            {
              "version": "e5eae4a0511241959498b180fa0df0d4f1b11b9c",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "88830f227a1f96e44d82ddfcb0cc81d517ec6dd8",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "3938b0336a93fa5faa242dc9e5823ac69df9e066",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "3.10.41",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.11"
            },
            {
              "version": "3.12.21",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.13"
            },
            {
              "version": "3.14.5",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.15"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.15"
            },
            {
              "version": "5.4.292",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.234",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.177",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.125",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.72",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}