{"id":"CVE-2026-89840","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate MOVE_RANGE destination size\n\nF2FS_IOC_MOVE_RANGE checks the source range, but not the destination end\nbefore updating i_size","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate MOVE_RANGE destination size\n\nF2FS_IOC_MOVE_RANGE checks the source range, but not the destination end\nbefore updating i_size. A source hole can expose th…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 4dd6f977fc778e5a0da604e5f8cb2f36d163d27b < dcae1eeda53149f219dd6af93b3083b7271c1c63","Linux >= 4dd6f977fc778e5a0da604e5f8cb2f36d163d27b < e533889fc26aea0cd83c90327063f272061dd820","Linux 4.8"],"published":"2026-09-16","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:27.507","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89840","references":[{"url":"https://git.kernel.org/stable/c/db13064669526494cd78ba3a4394063b740e940c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dcae1eeda53149f219dd6af93b3083b7271c1c63","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e533889fc26aea0cd83c90327063f272061dd820","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00141,"epssPercentile":0.03804,"ingestedAt":"2026-09-16T10:53:53.997Z","slug":"CVE-2026-89840","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate MOVE_RANGE destination size\n\nF2FS_IOC_MOVE_RANGE checks the source range, but not the destination end\nbefore updating i_size. A source hole can expose this: __clone_blkaddrs()\nskips NULL_ADDR entries and returns success, so the caller can still extend\nthe destination inode with unchecked pos_out + len.\n\nReject destination overflow and use inode_newsize_ok() before extending\nthe destination inode.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205212,"id":"CVE-2026-89840","ts":1789570705750,"field":"cvss","old":null,"new":"7.1"},{"seq":205211,"id":"CVE-2026-89840","ts":1789570705750,"field":"severity","old":"none","new":"high"}]}