CVE-2025-38618 – “vsock: VMADDR_PORT_ANY Binding Vulnerability”

CVE ID : CVE-2025-38618

Published : Aug. 22, 2025, 2:15 p.m. | 2 hours, 11 minutes ago

Description : In the Linux kernel, the following vulnerability has been resolved:

vsock: Do not allow binding to VMADDR_PORT_ANY

It is possible for a vsock to autobind to VMADDR_PORT_ANY. This can
cause a use-after-free when a connection is made to the bound socket.
The socket returned by accept() also has port VMADDR_PORT_ANY but is not
on the list of unbound sockets. Binding it will result in an extra
refcount decrement similar to the one fixed in fcdd2242c023 (vsock: Keep
the binding until socket destruction).

Modify the check in __vsock_bind_connectible() to also prevent binding
to VMADDR_PORT_ANY.

Severity: 0.0 | NA

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