Re: CVE-2021-47574: xen/netfront: harden netfront against event channel storms

[Juergen Gross]

On 19.06.24 16:54, Greg Kroah-Hartman wrote:
> Description
> ===========
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> xen/netfront: harden netfront against event channel storms
>
> The Xen netfront driver is still vulnerable for an attack via excessive
> number of events sent by the backend. Fix that by using lateeoi event
> channels.
>
> For being able to detect the case of no rx responses being added while
> the carrier is down a new lock is needed in order to update and test
> rsp_cons and the number of seen unconsumed responses atomically.
>
> This is part of XSA-391

When issuing XSA-391 the Xen security team already assigned CVE-2021-28712
to this issue.


Juergen

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