{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21636",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21636"
  ],
  "published": "2025-01-19T10:18:03Z",
  "summary": "sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: plpmtud_probe_interval: 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.probe_interval' is\nused.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21636"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449"
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      "url": "https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa"
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      "url": "https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917"
    },
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      "url": "https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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