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

CVE record · `CVE-2026-90176`

- **Identifiers:** `CVE-2026-90176`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `52fcbb92e0d3acfd1448b2a43b6595d540da5295 to before a89cc145832e81c32199d4ca2e1ea8bd51ed601d` (git)
  - affected: `da29cd197246c85c0473259f1cad897d9d28faea to before 993e0158331d37c04da18efe551b5e1e35fb3078` (git)
  - affected: `a6f4cfa3783804336491e0edcb250c25f9b59d33 to before f751d6e39d4c937c45f8fedc66699aa7d2d52288` (git)
  - affected: `571204e4758a528fbd67330bd4b0dfbdafb33dd8 to before 84c2d8e807ac489f5c91769293fb15dfdae8bae8` (git)
  - affected: `5d510ac31626ed157d2182149559430350cf2104 to before 07a9e289ff7edcc004f58952405f8a65c4e37512` (git)
  - affected: `5d510ac31626ed157d2182149559430350cf2104 to before d40c24634fe077a0dc91fd11fccf44ce12b454d5` (git)
  - affected: `6.1.160 to before 6.1.188` (semver)
  - affected: `6.6.120 to before 6.6.157` (semver)
  - affected: `6.12.64 to before 6.12.110` (semver)
  - affected: `6.18.3 to before 6.18.52` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.19`
  - unaffected: `before 6.19` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 43rd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90176](https://www.cve.org/CVERecord?id=CVE-2026-90176)
- [NVD: CVE-2026-90176](https://nvd.nist.gov/vuln/detail/CVE-2026-90176)

### References from the CNA

- <https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d>
- <https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078>
- <https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288>
- <https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8>
- <https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512>
- <https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-90176>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90176/>. Everything for agents: <https://agentprime.io/llms.txt>.