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Change History

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

rxrpc: Fix use of wrong skb when comparing queued RESP challenge serial

In rxrpc_post_response(), the code should be comparing the challenge serial
number from the cached response before deciding to switch to a newer
response, but looks at the newer packet private data instead, rendering the
comparison always false.

Fix this by switching to look at the older packet.

Fix further[1] to substitute the new packet in place of the old one if
newer and also to release whichever we don't use.

https://git.kernel.org/stable/c/20386e7f8d97475b8d815873e246423317ec4260

https://git.kernel.org/stable/c/9132b1a7bf83b4a8042fffbc99d075b727a16742

https://git.kernel.org/stable/c/b33f5741bb187db8ff32e8f5b96def77cc94dfca