Linux · Linux · CVE-2019-18198
**Name of the Vulnerable Software and Affected Versions**
Linux versions prior to 5.3.4
**Description**
A local attacker can exploit a reference count usage error in the `fib6 rule suppress()` function in the fib6 suppression feature of the `net/ipv6/fib6 rules.c` file, when handling the `FIB LOOKUP NOREF` flag, to corrupt memory. This issue is related to the lack of resource release after its expiration, which can allow an attacker to cause memory damage.
**Recommendations**
For versions prior to 5.3.4, update to version 5.3.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the `fib6 rule suppress()` function until a patch is available.