smb: client: let recv_done verify data_offset, data_length and remaining_data_length
CVE-2025-39933 · published 4 Oct 2025
How serious is it
- Severity: critical, CVSS score 9.4 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2025-39933?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: f198186aa9bbd60fae7a2061f4feec614d880299 to < f23d5c6b7540ec9b1e73a8ea3b2ae9045248d728, f198186aa9bbd60fae7a2061f4feec614d880299 to < 241e58de23e7c1bbb9bee526c17d9a0f2a90fbad, f198186aa9bbd60fae7a2061f4feec614d880299 to < 581fb78e0388b78911b0c920e4073737090c8b5f, f198186aa9bbd60fae7a2061f4feec614d880299 to < f57e53ea252363234f86674db475839e5b87102e
- Linux Linux: 4.16
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
smb: client: let recv_done verify data_offset, data_length and remaining_data_length
This is inspired by the related server fixes.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/f23d5c6b7540ec9b1e73a8ea3b2ae9045248d728
- git.kernel.org/stable/c/241e58de23e7c1bbb9bee526c17d9a0f2a90fbad
- git.kernel.org/stable/c/581fb78e0388b78911b0c920e4073737090c8b5f
- git.kernel.org/stable/c/f57e53ea252363234f86674db475839e5b87102e
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON