The activity in testing branch - along with the release of review ISO indicates that a stable snap is around the corner.
Temporary mitigation available - see
If you think you are a target for an exploit like this, consider switching to testing branch.
sudo pacman-mirrors -aS testing && sudo pacman -Syyu
If you are part of a multi-user system running on Manjaro stable branch and kernel 6.18.18 consider informing the administrator responsible for the server you are connecting to.