{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  smb/client: validate new EOF for insert range  smb3_insert_range() does not check if the new file size (i_size + len) is valid. This allows FALLOC_FL_INSERT_RANGE to bypass RLIMIT_FSIZE, exceed s_maxbytes, or produce a size outside the loff_t range.  Use check_add_overflow() to calculate the new EOF. Validate it with inode_newsize_ok() before modifying the file.  Reproducer, using a file on a CIFS mount:  \tbash -c ' \t\tFILE=/mnt/cifs/repro  \t\ttrap \"\" SIGXFSZ \t\tulimit -f 3072\t\t# RLIMIT_FSIZE = 3 MiB  \t\t# A regular write is stopped at 3 MiB. \t\tdd if=/dev/zero of=\"$FILE\" bs=1M count=4 status=none \t\tstat -c \"size after write: %s\" \"$FILE\"  \t\t# Insert 2 MiB into a 2 MiB file. \t\ttruncate -s 2M \"$FILE\" \t\tfallocate -i -o 0 -l 2M \"$FILE\" \t\tstat -c \"size after insert: %s\" \"$FILE\" \t'  Before this change, the regular write stops at the 3 MiB limit, but insert range grows the file to 4 MiB:  \tdd: error writing '/mnt/cifs/repro': File too large \tsize after write: 3145728 \tsize after insert: 4194304  After this change, insert range also fails at the limit and leaves the 2 MiB file unchanged:  \tdd: error writing '/mnt/cifs/repro': File too large \tsize after write: 3145728 \tfallocate: fallocate failed: File too large \tsize after insert: 2097152",
  "id": "DEBIAN-CVE-2026-98127",
  "modified": "2026-09-26T04:47:40.565581248Z",
  "published": "2026-09-25T11:17:44.050Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98127"
    }
  ],
  "upstream": [
    "CVE-2026-98127"
  ]
}