Unchecked NULL pointer usage when handling invalid aliases in CopyKeyAliasesToKeymap in xkbcomp/keycodes.c in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libxkbcommon | Xkbcommon | * | 0.8.1 (excluding) |
| Xkbcommon | Xkbcommon | * | 0.8.1 (excluding) |
| Libxkbcommon | Ubuntu | bionic | * |
| Libxkbcommon | Ubuntu | upstream | * |
| Libxkbcommon | Ubuntu | xenial | * |