CVE-2026-43377 ksmbd: Don't log keys in SMB3 signing and encryption key generation
Attackers with debug access can read sensitive SMB3 signing and encryption keys from logs, compromising session security.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43377?
CVE-2026-43377 is a high-severity vulnerability in Linux kernel, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-43377?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43377?
Apply the vendor's patch.
Is CVE-2026-43377 being exploited?
There is no known exploitation of CVE-2026-43377 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43377, DEBIAN-CVE-2026-43377, GHSA-95vc-3rg6-xgp2, ROOT-OS-UBUNTU-2204-CVE-2026-43377, ROOT-OS-UBUNTU-2404-CVE-2026-43377, UBUNTU-CVE-2026-43377.