What’s Vulnerable › Vulnerabilities

CVE-2022-50859: cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message Commit d5c7076b772a ("smb3: add smb3.1.1 to default dialect list") extend the dialects from 3 to 4, but forget to decrease the extended length when specific the dialect, then the message length is larger than expected. This maybe leak some info through network because not initialize the message body. After apply this patch, the VALIDATE_NEGOTIATE_INFO message length is reduced from 28 bytes to 26 bytes.

Affected products

• Linux kernel: 5.0 — fixed in 6.1

How to fix

Upgrade to a fixed version: Linux kernel 6.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/60480291c1fcafad8425d93f771b5bcc2bd398b4
• https://git.kernel.org/stable/c/9312e04b6c6bc46354ecd0cc82052a2b3df0b529
• https://git.kernel.org/stable/c/943eb0ede74ecd609fdfd3f0b83e0d237613e526
• https://git.kernel.org/stable/c/d0050ec3ebbcb3451df9a65b8460be9b9e02e80c
• https://git.kernel.org/stable/c/e98ecc6e94f4e6d21c06660b0f336df02836694f
• https://git.kernel.org/stable/c/fada9b8c95c77bb46b89e18117405bc90fce9f74

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