Bug 2390316 (CVE-2025-38618)

Summary: CVE-2025-38618 kernel: vsock: Do not allow binding to VMADDR_PORT_ANY
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-08-22 14:01:27 UTC 
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.
Comment 1 Keith Grant 2025-08-22 14:10:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025082213-CVE-2025-38618-1f1a@gregkh/T