kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges...

CVE-2025-38523

CVE-2025-38523 affects the Linux kernel CIFS/SMB client path. The issue stems from the smbd_response slab’s packet trailer not being marked as allowed for usercopy, causing kernel memory exposure checks in copy_to_iter() to trip when HARDENED_USERCOPY is enabled. The fix is in the kernel by confi...

The vulnerability of the cifs_signal_cifsd_for_reconnect() function in the Linux kernel’s SMB client implementation allows a hacker to cause a service failure.

The vulnerability of the cifssignalcifsdforreconnect function in the fs/smb/client/connect.c module of the SMB protocol client implementation in Linux kernel is related to the reutilization of previously freed memory. Exploiting this vulnerability could allow an attacker to cause a service failur...