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Change History

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

eth: fbnic: Add validation for MTU changes

Increasing the MTU beyond the HDS threshold causes the hardware to
fragment packets across multiple buffers. If a single-buffer XDP program
is attached, the driver will drop all multi-frag frames. While we can't
prevent a remote sender from sending non-TCP packets larger than the MTU,
this will prevent users from inadvertently breaking new TCP streams.

Traditionally, drivers supported XDP with MTU less than 4Kb
(packet per page). Fbnic currently prevents attaching XDP when MTU is too high.
But it does not prevent increasing MTU after XDP is attached.

https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df

https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df

https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e