{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cae932d3aee55035a54415dcea8e7ecf2ec469b5"
            },
            {
              "fixed": "18c2e20b42dd21db599e42d05ddaeeb647b2bb6d"
            },
            {
              "fixed": "4bc2d72c7695cedf6d4e1a558924903c2b28a78e"
            },
            {
              "fixed": "00d6df7115f6972370974212de9088087820802e"
            },
            {
              "fixed": "67e467a11f62ff64ad219dc6aa5459e132c79d14"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31438.json"
  },
  "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.",
  "id": "CVE-2026-31438",
  "modified": "2026-07-15T01:49:16.408342091Z",
  "published": "2026-04-22T13:53:37.053Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31438.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31438"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators"
}