Bug 2468190 (CVE-2026-43377)

Summary:	CVE-2026-43377 kernel: ksmbd: Don't log keys in SMB3 signing and encryption key generation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in ksmbd in the Linux kernel. When KSMBD_DEBUG_AUTH logging is enabled, sensitive session, signing, encryption, and decryption key bytes are logged. This can lead to information disclosure, potentially exposing user credentials.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-08 15:03:53 UTC

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.

Comment 1 Keith Grant 2026-05-08 21:08:03 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050831-CVE-2026-43377-b039@gregkh/T