{"id":"CVE-2026-98126","title":"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_FSI…","summary":"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_FSI…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 72c419d9b073628d3b5b0b2fc787b724f1a8c726 < 3673f057b64abfa957e8ae84448db69369a5091a","Linux >= 72c419d9b073628d3b5b0b2fc787b724f1a8c726 < 06a4f9049cb6dc319bceec2dc813ba89add8b828","Linux >= 72c419d9b073628d3b5b0b2fc787b724f1a8c726 < f320ca20c273a26cd779bdb2b2e4b076a95c76f6","Linux >= 72c419d9b073628d3b5b0b2fc787b724f1a8c726 < 88972e35750792e717af287dc71f42a03b5cbce4","Linux 5.1"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:43.940","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98126","references":[{"url":"https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.814Z","slug":"CVE-2026-98126","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}