{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31438",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31438"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators\n\nWhen a process crashes and the kernel writes a core dump to a 9P\nfilesystem, __kernel_write() creates an ITER_KVEC iterator. This\niterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which\nonly handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,\nhitting the BUG() for any other type.\n\nFix this by adding netfs_limit_kvec() following the same pattern as\nnetfs_limit_bvec(), since both kvec and bvec are simple segment arrays\nwith pointer and length fields. Dispatch it from netfs_limit_iter() when\nthe iterator type is ITER_KVEC.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31438"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}