xkbcommon null pointer dereference vulnerability (CNVD-2019-02670)

xkbcommon is a keyboard key mapping compiler and support library. A null pointer dereference vulnerability exists in the 'LookupModMask' function of the xkbcomp/expr.c file in versions of xkbcommon prior to xkbcommon 0.8.2, which can be exploited by a local attacker by submitting a specially...