Linux Kernel ksmbd Refcount Leak Vulnerability in smb2_open

A refcount leak vulnerability has been identified in the Linux kernel's ksmbd component, specifically within the smb2_open function. This issue arises when memory allocation fails, causing the reference count of access control lists (acls) to leak. The vulnerability has been addressed by adding the missing posix_acl_release function to properly manage the reference count.

Impact

The vulnerability could lead to a memory leak, where reference counts are not properly released, potentially causing increased memory usage over time.