CVE-2025-21756

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

Description A use-after-free issue has been identified in the Linux kernel, specifically in the vsock subsystem. This issue arises when a socket is unbound during a transport reassignment, leading to a potential use-after-free scenario. The problem occurs due to the incorrect handling of socket bindings, both explicit and implicit, during the connect() and bind() operations. Technical details include the involvement of functions such as vsock create(), vsock insert unbound(), vsock remove bound(), and vsock bind(). The issue can lead to a slab-use-after-free error, as reported by KASAN.

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