Do we have any sources on that? I am quite willing to respond to a clear risk. It wasn't all that clear to me; my impression was that one or two anecdotes caused mass panic.
There are more sources than you can shake a stick at. Just do a little searching yourself. There are failures reported as recently as last week. I'm still amazed that people aren't aware of the issue at hand. Here is a short explanation:
K&N filters used to be (years ago) a quality part. They were at the time manufactured under contract by HiFlo for K&N. A number of years ago (at least 3) K&N - for at least a couple reasons that I'm aware of ceased having HiFlo do their manufacturing, and shifted to a low cost country source for manufacture of said filters - as well as changing material suppliers. Since that time, there are two different known failure modes of the K&N filters.
1) The seal itself has failed. The seal apparently even when properly torqued (not over torqued) - and not just because the previous O-ring was not removed - fails, resulting in oil being pumped out between the mating surface of the oil filter canister and the engine mount surface.
2) The welded nut/flange on the top of the filter develops cracks/voids either in the welds, or surrounding the welds between that flange and the canister itself. This happens at times even if the nut is not used at all for actually installing the filter - but is (if used at all) only used to safety wire the filter. This is apparently due to a combination of poor material quality and poor manufacturing process. It is NOT - repeat NOT - a result of people who use the nut to tighten the filter - nor is it due to over-tightening.
The recalled filters were restricted to a very small date range of only the 204 (both black and chrome) filters. However, you yourself can find tons of examples of other K&N filters failing in one or both of the above mentioned failure modes that are outside of both that manufacture date range or of a different part number (i.e., motorcycle type).
So the question is: What exactly is it that makes the K&N filter so desirable to you that you choose it rather than an OEM or HiFlo filter? If there is even a small risk of known failure, but the OEM or HiFlo filters have effectively zero known failures, why take the chance on something that on a racetrack could be so significant? The HiFlo racing series of filters have a very similar appearance to the K&N (including the nut) if you really like that feature. Otherwise, a simple hose clamp around the canister accomplishes the same function as well on an OEM filter.