What’s Vulnerable › Vulnerabilities

CVE-2026-43377: ksmbd: Don't log keys in SMB3 signing and encryption key generation

• Severity: high (CVSS 8.1 v3.1)
• 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: 2026-05-08 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Don't log keys in SMB3 signing and encryption key generation When KSMBD_DEBUG_AUTH logging is enabled, generate_smb3signingkey() and generate_smb3encryptionkey() log the session, signing, encryption, and decryption key bytes. Remove the logs to avoid exposing credentials.

Affected products

• Linux kernel: from 5.15 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2, 7.0-rc3 — fixed in 6.1.167, 6.12.78, 6.18.20, 6.19.9, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.78, 6.18.20, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3fe2d9ec166b7df9a8df6c0fdcfc210572e27e3f
• https://git.kernel.org/stable/c/407cc37c21d51f9b9d4d20204b04890880cfa6ae
• https://git.kernel.org/stable/c/4084ed720d7d5f4e975c9e4a6267a552dad3b24a
• https://git.kernel.org/stable/c/441336115df26b966575de56daf7107ed474faed
• https://git.kernel.org/stable/c/c6b01b997a2094969e315f1ebfc1d64b8ae2163d
• https://git.kernel.org/stable/c/fec5c70b82af3f59f15bb984df94e5ad1fccfb1e

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