Re: CVE-2022-48900: xen/netfront: react properly to failing gnttab_end_foreign_access_ref()

[Juergen Gross]

Please revoke this CVE, as CVE-2022-23042 has been allocated for this issue
2 years ago already.

This is even clearly visible ...

On 22.08.24 05:31, Greg Kroah-Hartman wrote:
> Description
> ===========
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> xen/netfront: react properly to failing gnttab_end_foreign_access_ref()
>
> When calling gnttab_end_foreign_access_ref() the returned value must
> be tested and the reaction to that value should be appropriate.
>
> In case of failure in xennet_get_responses() the reaction should not be
> to crash the system, but to disable the network device.
>
> The calls in setup_netfront() can be replaced by calls of
> gnttab_end_foreign_access(). While at it avoid double free of ring
> pages and grant references via xennet_disconnect_backend() in this case.
>
> This is CVE-2022-23042 / part of XSA-396.

... here.


Juergen

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