As outlined in this weblog post:

* https://ubuntu.com/blog/fixes-available-in-proposed-pocket-f...

The fixes were in the "proposed" repo since October 26 (noble) and 28 (resolute):

* https://launchpad.net/ubuntu/+source/linux

One could pull them down at any point in the last week. Yesterday afternoon they were still in "proposed", but I checked this morning (EST/UTC-5) and they there were in "updates". Some tracking of timeline of when the updates to the repos happened seems to be available at:

* https://ma.ttias.be/linux-cve-2026-98432-vulnerable-kernels/

The kernels goes through an QA testing processes, and per this September post, they're looking at shortening the timeframe for kernel updates:

* https://canonical.com/blog/accelerating-delivery-of-cve-fixe...