The kernel is vulnerable to denial of service in arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c via sigreturn() system call.
www.openwall.com/lists/oss-security/2019/07/30/1
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.8_release_notes/index
access.redhat.com/errata/RHSA-2020:1016
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1507149
bugzilla.redhat.com/show_bug.cgi?id=1651706
bugzilla.redhat.com/show_bug.cgi?id=1694201
bugzilla.redhat.com/show_bug.cgi?id=1702264
bugzilla.redhat.com/show_bug.cgi?id=1711520
bugzilla.redhat.com/show_bug.cgi?id=1733347
bugzilla.redhat.com/show_bug.cgi?id=1749390
bugzilla.redhat.com/show_bug.cgi?id=1750577
bugzilla.redhat.com/show_bug.cgi?id=1757325
bugzilla.redhat.com/show_bug.cgi?id=1757872
bugzilla.redhat.com/show_bug.cgi?id=1758001
bugzilla.redhat.com/show_bug.cgi?id=1760294
bugzilla.redhat.com/show_bug.cgi?id=1770404
git.kernel.org/torvalds/c/f16d80b75a096c52354c6e0a574993f3b0dfbdfe
lists.fedoraproject.org/archives/list/[email protected]/message/GRK2MW223KQZ76DKEF2BZFN6TCXLZLDS/
patchwork.ozlabs.org/patch/1133904/
security.netapp.com/advisory/ntap-20190806-0001/