ghsa-2gpq-mc93-wwwp
Vulnerability from github
Published
2025-01-19 12:31
Modified
2025-04-10 15:31
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: 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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21640"
  ],
  "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: 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.",
  "id": "GHSA-2gpq-mc93-wwwp",
  "modified": "2025-04-10T15:31:40Z",
  "published": "2025-01-19T12:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21640"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03ca51faba2b017bf6c90e139434c4117d0afcdc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1031462a944ba0fa83c25ab1111465f8345b5589"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5599b212d2f4466e1832a94e9932684aaa364587"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b"
    }
  ],
  "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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