{"id":"CVE-2026-90176","published":"2026-09-17T17:17:11.387","lastModified":"2026-09-18T18:17:45.533","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Do not skip lock checks for single-byte ranges\n\ncheck_lock_range() uses inclusive ranges. Its callers pass the end\noffset as start + length - 1, so start == end represents a valid\nsingle-byte range rather than an empty range.\n\nThe start == end shortcut therefore skips mandatory byte-range lock\nchecks for one-byte reads, writes, copychunk operations and one-byte\ntruncate ranges. A conflicting lock covering that byte is not checked\nand the operation is allowed to proceed.\n\nRemove the shortcut. The truncate size == inode->i_size case is already\nhandled by only calling check_lock_range() when the new size differs\nfrom the current file size.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512","tags":[]},{"url":"https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8","tags":[]},{"url":"https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078","tags":[]},{"url":"https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d","tags":[]},{"url":"https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5","tags":[]},{"url":"https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}