CVE-2026-64401

CVE-2026-64401 affects the Linux kernel SMB/CIFS client. The bug occurs in cifs_swn_notify() which, under cifs_swnreg_idr_mutex, uses a cached tcon pointer that is not a stable reference, risking use-after-free when multiple tcons exist for a net/share. A same-share mount can keep the registratio...

EUVD-2026-48945

In the Linux kernel, the following vulnerability has been resolved: smb: client: resolve SWN tcon from live registrations cifsswnnotify looks up a witness registration by id under cifsswnregidrmutex, drops the mutex, and then uses the registration's cached tcon pointer. That pointer is not a...

Linux Distros Unpatched Vulnerability : CVE-2026-64401

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - smb: client: resolve SWN tcon from live registrations cifsswnnotify looks up a witness registration by id under cifsswnregidrmutex, drops the mutex, and then us...

PT-2026-64622

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A use-after-free issue exists in the SMB client. The cifs swn notify function retrieves a witness registration by ID using the cifs swnreg idr mutex mutex, releases the mutex, and...