{"id":"CVE-2026-90176","title":"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","summary":"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 …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","vendor":"Linux","product":"Linux","affected":["Linux >= 52fcbb92e0d3acfd1448b2a43b6595d540da5295 < a89cc145832e81c32199d4ca2e1ea8bd51ed601d","Linux >= da29cd197246c85c0473259f1cad897d9d28faea < 993e0158331d37c04da18efe551b5e1e35fb3078","Linux >= a6f4cfa3783804336491e0edcb250c25f9b59d33 < f751d6e39d4c937c45f8fedc66699aa7d2d52288","Linux >= 571204e4758a528fbd67330bd4b0dfbdafb33dd8 < 84c2d8e807ac489f5c91769293fb15dfdae8bae8","Linux >= 5d510ac31626ed157d2182149559430350cf2104 < 07a9e289ff7edcc004f58952405f8a65c4e37512","Linux >= 5d510ac31626ed157d2182149559430350cf2104 < d40c24634fe077a0dc91fd11fccf44ce12b454d5","Linux >= 6.1.160 < 6.1.188","Linux >= 6.6.120 < 6.6.157","Linux >= 6.12.64 < 6.12.110","Linux >= 6.18.3 < 6.18.52","Linux 6.19"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:45.533","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90176","references":[{"url":"https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00487,"epssPercentile":0.40878,"ingestedAt":"2026-09-17T16:21:47.868Z","slug":"CVE-2026-90176","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207165,"id":"CVE-2026-90176","ts":1789757337864,"field":"cvss","old":null,"new":"8.1"},{"seq":207164,"id":"CVE-2026-90176","ts":1789757337864,"field":"severity","old":"none","new":"high"}]}