Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file with invalid virtual modifiers.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-15862.json"