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CVE-2026-90176

ksmbd: Do not skip lock checks for single-byte ranges PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not skip lock checks for single-byte ranges check_lock_range() uses inclusive ranges. Its callers pass the end offset as start + length - 1, so start == end represents a valid single-byte range rather than an empty range. The start == end shortcut therefore skips mandatory byte-range lock checks for one-byte reads, writes, copychunk operations and one-byte truncate ranges. A conflicting lock covering that byte is not checked and the operation is allowed to proceed. Remove the shortcut. The truncate size == inode->i_size case is already handled by only calling check_lock_range() when the new size differs from the current file size.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 52fcbb92e0d3acfd1448b2a43b6595d540da5295 before a89cc145832e81c32199d4ca2e1ea8bd51ed601d; affected da29cd197246c85c0473259f1cad897d9d28faea before 993e0158331d37c04da18efe551b5e1e35fb3078; affected a6f4cfa3783804336491e0edcb250c25f9b59d33 before f751d6e39d4c937c45f8fedc66699aa7d2d52288; affected 571204e4758a528fbd67330bd4b0dfbdafb33dd8 before 84c2d8e807ac489f5c91769293fb15dfdae8bae8; affected 5d510ac31626ed157d2182149559430350cf2104 before 07a9e289ff7edcc004f58952405f8a65c4e37512; affected 5d510ac31626ed157d2182149559430350cf2104 before d40c24634fe077a0dc91fd11fccf44ce12b454d5; affected 6.1.160 before 6.1.188; affected 6.6.120 before 6.6.157; affected 6.12.64 before 6.12.110; affected 6.18.3 before 6.18.52
Linux / Linuxaffected 6.19; unaffected 0 before 6.19; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References