CVE-2019-20422

A flaw was found in the Linux kernel prior to version 5.3.4. Affected code was introduced in a recent patch of fib6_rule_lookup in net/ipv6/ip6_fib.c in the IPv6 subsystem of the kernel which was found to mishandle the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to a crash. Availability is the highest threat from this vulnerability.

The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux making this vulnerable not applicable to these platforms.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.