{"id":"CVE-2026-90176","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-90176","summary":"ksmbd: Do not skip lock checks for single-byte ranges","details":"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.","published":"2026-09-17T16:07:02.433Z","modified":"2026-09-19T03:47:28.799974192Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.1.188"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90176.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90176"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T03:47:28.799974192Z"}}