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->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, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' 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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