CVE-2026-90176ksmbd: Do not skip lock checks for single-byte ranges
- 8.1HighCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Received | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected 52fcbb92e0d3acfd1448b2a43b6595d540da5295 – < a89cc145832e81c32199d4ca2e1ea8bd51ed601d
- affected da29cd197246c85c0473259f1cad897d9d28faea – < 993e0158331d37c04da18efe551b5e1e35fb3078
- affected a6f4cfa3783804336491e0edcb250c25f9b59d33 – < f751d6e39d4c937c45f8fedc66699aa7d2d52288
- affected 571204e4758a528fbd67330bd4b0dfbdafb33dd8 – < 84c2d8e807ac489f5c91769293fb15dfdae8bae8
- affected 5d510ac31626ed157d2182149559430350cf2104 – < 07a9e289ff7edcc004f58952405f8a65c4e37512
- affected 5d510ac31626ed157d2182149559430350cf2104 – < d40c24634fe077a0dc91fd11fccf44ce12b454d5
- affected 6.1.160 – < 6.1.188
- affected 6.6.120 – < 6.6.157
- affected 6.12.64 – < 6.12.110
- affected 6.18.3 – < 6.18.52
- affected 6.19
- unaffected < 6.19
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d (opens in a new tab)
- https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078 (opens in a new tab)
- https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288 (opens in a new tab)
- https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8 (opens in a new tab)
- https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512 (opens in a new tab)
- https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-81769 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-90176)Record last updated .