Inclusion of Sensitive Information in Log Files in Linux kernel - CVE-2026-43377
Published: May 9, 2026
Vulnerability identifier: #VU130812
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43377
CWE-ID: CWE-532
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to insertion of sensitive information into log files in generate_smb3signingkey() and generate_smb3encryptionkey() when debug authentication logging is enabled during SMB3 signing and encryption key generation. A local user can access generated logs containing session, signing, encryption, and decryption key bytes to disclose sensitive information.
Only systems with KSMBD_DEBUG_AUTH logging enabled are affected by this exposure.
How to mitigate CVE-2026-43377
Install security update from vendor's repository.
Sources
- 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