CVE-2026-64390

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the ksmbd module where byte-range locks are not correctly tracked across connections. When using SMB3 multichannel, the connection that handles a SMB2 LOCK request may differ from the connection that opened the file. This allows a connection list entry to be removed using a spinlock different from the one protecting the list, potentially leading to a use-after-free scenario where concurrent traversals access freed struct ksmbd lock and struct file lock objects.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.