CVE-2026-23303 smb: client: Don't log plaintext credentials in cifs_set_cifscreds
Attackers with debug log access can read plaintext SMB credentials when debug logging is enabled in the Linux kernel SMB client.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23303?
CVE-2026-23303 is a medium-severity vulnerability in Linux kernel, published on 25 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: Don't log plaintext credentials in cifs_set_cifscreds
When debug logging is enabled, cifs_set_cifscreds() logs the key payload and exposes the plaintext username and password. Remove the debug log to avoid exposing credentials.
Which versions are affected by CVE-2026-23303?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23303?
Apply the vendor's patch.
Is CVE-2026-23303 being exploited?
There is no known exploitation of CVE-2026-23303 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-80643, BELL-CVE-2026-23303, DEBIAN-CVE-2026-23303, GHSA-7rpf-jpp6-g4v7, ROOT-OS-DEBIAN-11-CVE-2026-23303, ROOT-OS-DEBIAN-12-CVE-2026-23303 and 4 more.