Answer in brief
CVE-2026-90176 records a High severity (CVSS 8.1) vulnerability in ksmbd: Do not skip lock checks for single-byte ranges. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=52fcbb92e0d3acfd1448b2a43b6595d540da5295 <a89cc145832e81c32199d4ca2e1ea8bd51ed601d || >=da29cd197246c85c0473259f1cad897d9d28faea <993e0158331d37c04da18efe551b5e1e35fb3078 || >=a6f4cfa3783804336491e0edcb250c25f9b59d33 <f751d6e39d4c937c45f8fedc66699aa7d2d52288 || >=571204e4758a528fbd67330bd4b0dfbdafb33dd8 <84c2d8e807ac489f5c91769293fb15dfdae8bae8 || >=5d510ac31626ed157d2182149559430350cf2104 <07a9e289ff7edcc004f58952405f8a65c4e37512 || >=5d510ac31626ed157d2182149559430350cf2104 <d40c24634fe077a0dc91fd11fccf44ce12b454d5 || >=6.1.160 <6.1.188 || >=6.6.120 <6.6.157 || >=6.12.64 <6.12.110 || >=6.18.3 <6.18.52 | a89cc145832e81c32199d4ca2e1ea8bd51ed601d, 993e0158331d37c04da18efe551b5e1e35fb3078, f751d6e39d4c937c45f8fedc66699aa7d2d52288, 84c2d8e807ac489f5c91769293fb15dfdae8bae8, 07a9e289ff7edcc004f58952405f8a65c4e37512, d40c24634fe077a0dc91fd11fccf44ce12b454d5, 6.1.188, 6.6.157, 6.12.110, 6.18.52 |
| Linux/Linuxgeneric | 6.19 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.