ghsa-vrx4-x92w-9vhv
Vulnerability from github
Published
2025-01-19 12:31
Modified
2025-11-03 21:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

sctp: sysctl: auth_enable: 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.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21638"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-19T11:15:09Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: 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.",
  "id": "GHSA-vrx4-x92w-9vhv",
  "modified": "2025-11-03T21:32:13Z",
  "published": "2025-01-19T12:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21638"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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