Re: CVE-2023-53502: xen/netback: Fix buffer overrun triggered by unusual packet

[Juergen Gross]

On 01.10.25 13:45, Greg Kroah-Hartman wrote:
> From: Greg Kroah-Hartman <gregkh@xxxxxxxxxx>
>
> Description
> ===========
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> xen/netback: Fix buffer overrun triggered by unusual packet
>
> It is possible that a guest can send a packet that contains a head + 18
> slots and yet has a len <= XEN_NETBACK_TX_COPY_LEN. This causes nr_slots
> to underflow in xenvif_get_requests() which then causes the subsequent
> loop's termination condition to be wrong, causing a buffer overrun of
> queue->tx_map_ops.
>
> Rework the code to account for the extra frag_overflow slots.
>
> This is CVE-2023-34319 / XSA-432.
>
> The Linux kernel CVE team has assigned CVE-2023-53502 to this issue.

As can be seen right above your line "The Linux kernel CVE team ..."
this issue has been handled by the Xen security team already and a
CVE is assigned since then.

Please revoke your CVE assignment.


Juergen

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