Greg Kroah-Hartman has announced the release of the 5.7.2, 5.6.18,
5.4.46, 4.19.128, 4.14.184, 4.9.227, and 4.4.227 stable kernels. These contain
mitigations
for the special register buffer data
sampling (SRBDS) hardware vulnerability, as well as other fixes
elsewhere in the trees. Users of those series should upgrade.

Source: LWN.net – Seven new stable kernels