In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26
github.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26
launchpad.net/bugs/1847478
security.netapp.com/advisory/ntap-20191031-0005/
usn.ubuntu.com/4161-1/