People keep repeating this claim because it sounds dramatic, but I'm not sure it's a fair description. The original source appears to be a single snide tweet from @grsecurity [1] referencing this comment [2].
It's far from obvious that the comment was even "redacted" at all. It seems more likely that "stay tuned" is either a reference to the more detailed comments elsewhere in the patch (in arch/x86/kernel/ldt.c), or a reflection of the fact (which is clearly spelled out in the commit message) that future patches are likely to change the location of the LDT mapping.
I've skimmed through the commit messages and comments from the latest patchset [3] and couldn't find anything else that even hinted at redaction, nor could I find any mention of redactions on the linux-kernel mailing list.
Furthermore, it's worth bearing in mind that @grsecurity has been involved in numerous public feuds with the Linux security folks. So in the absence of concrete evidence, I'm not particularly inclined to assume his tweet was made in good faith.
[1]: https://twitter.com/grsecurity/status/947147105684123649
[2]: https://github.com/torvalds/linux/commit/f55f0501cbf65ec41cc...
I actually think it will - it would be easy to give more accurate details that cause many readers to glaze over.
> How to ELI5 the risk in desktop PC? A piece of JavaScript in some 0x0 pixel iframe in a tab you're not even looking at stealing your passwords and SSH keys
(Although nothing is proven in the latter regard, I wouldn't be per se surprised to see something in that direction once the exact nature of the issue is more widely known)
Seems like very little got through to the media about the details regarding this flaws effects and costly workaround.