{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "72c419d9b073628d3b5b0b2fc787b724f1a8c726"
            },
            {
              "fixed": "3673f057b64abfa957e8ae84448db69369a5091a"
            },
            {
              "fixed": "06a4f9049cb6dc319bceec2dc813ba89add8b828"
            },
            {
              "fixed": "f320ca20c273a26cd779bdb2b2e4b076a95c76f6"
            },
            {
              "fixed": "88972e35750792e717af287dc71f42a03b5cbce4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.1.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98126.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: validate new EOF for zero range\n\nWhen FALLOC_FL_ZERO_RANGE is used without FALLOC_FL_KEEP_SIZE,\nsmb3_zero_range() may extend EOF without checking RLIMIT_FSIZE, allowing\nthe file to grow beyond the caller's file-size limit.\n\nFix this by calling inode_newsize_ok() before sending the zero-range\nrequest when the operation would extend EOF.\n\nReproducer, using a file on a CIFS mount:\n\n\tbash -c '\n\t        FILE=/mnt/cifs/repro\n\n\t        trap \"\" SIGXFSZ\n\t        ulimit -f 3072\n\n\t        truncate -s 2M \"$FILE\"\n\t        fallocate --zero-range -o 0 -l 4M \"$FILE\"\n\t        echo \"fallocate rc=$?\"\n\t        stat -c \"file size=%s\" \"$FILE\"\n\t'\n\nBefore this change, the operation succeeds despite the 3 MiB limit:\n\n\tfallocate rc=0\n\tfile size=4194304\n\nAfter this change, fallocate fails and leaves the file at 2 MiB.",
  "id": "CVE-2026-98126",
  "modified": "2026-09-27T03:30:54.775144090Z",
  "published": "2026-09-25T10:36:07.797Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98126.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98126"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "smb/client: validate new EOF for zero range"
}