HighFix available
ksmbd: Do not skip lock checks for single-byte ranges
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
- CVEs
- CVE-2026-90176
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:20 UTC · Revision 1
Source evidence
ksmbd: Do not skip lock checks for single-byte ranges
core-osv · Original sourcePublished 17 Sept 2026, 16:07 UTC
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.
osv:CVE-2026-90176
Kernel
Fixed versions: 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6
Complete source record
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