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

net: openvswitch: reallocate update replies for mismatched IDs

ovs_flow_cmd_new() preallocates the optional reply skb before it takes
ovs_mutex and before it knows which existing flow will be updated.

That is normally fine because the skb is sized from the request flow
identifier.  That identifier also becomes the inserted flow's identifier.
For updates, however, a request with a UFID may miss the UFID lookup and
then fall back to the flow key lookup.  That lookup can legitimately find
an existing key-identified flow.  UFIDs are optional and the flow key is
the primary identifier.

For echoed replies, ovs_flow_cmd_fill_info() writes the matched flow's
identifier, not the request identifier used for the preallocation.  A short
request UFID can therefore leave too little room for the key identifier.
The fill can then fail with -EMSGSIZE and hit the BUG_ON(error < 0) in the
update path.

Once the update target has been resolved, reallocate the reply skb if the
matched flow needs a larger reply than the request identifier allowed.  Do
this before replacing the actions so the request can still fail cleanly if
the rare extra allocation fails.

https://git.kernel.org/stable/c/00f987f066e802793a37dd2167459e67cf2cf2ec

https://git.kernel.org/stable/c/20751193d83be2e9735d4faee71375691c09cd13

https://git.kernel.org/stable/c/23716dd9d8d46a5908536b73dc085e62f2b5c237

https://git.kernel.org/stable/c/5d1c224dd914579524a183a514c12b95095d12ce

https://git.kernel.org/stable/c/696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc

https://git.kernel.org/stable/c/69f40ccf85074981340847d650a9cbf9adabfbbe

https://git.kernel.org/stable/c/87d0c0040b5d4b61de51ae39132c4c46709f2f77

https://git.kernel.org/stable/c/bd8ca84d48cd9a4f6fc63df26512c55e1d339927

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