In the Linux kernel, the following vulnerability has been resolved:

apparmor: fix NULL sock in aasockfileperm

Deal with the potential that sock and sock-sk can be NULL during socket setup or teardown. This could lead to an oops. The fix for NULL pointer dereference in unixneedsrevalidation shows this is at least possible for afunix sockets. While the fix for afunix sockets applies for newer mediation this is still the fall back path for older afunix mediation and other sockets, so ensure it is covered.