https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2018-15864.htmlhttps://patchthecve.com/cve/CVE-2018-15864.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: Unchecked NULL pointer usage in resolve_keysym in xkbcomp/parser.y 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, because a map access attempt can occur for a map that was never created.https://patchthecve.com/cve/CVE-2018-15863.htmlhttps://patchthecve.com/cve/CVE-2018-15863.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: Unchecked NULL pointer usage in ResolveStateAndPredicate in xkbcomp/compat.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 a no-op modmask expression.https://patchthecve.com/cve/CVE-2018-15862.htmlhttps://patchthecve.com/cve/CVE-2018-15862.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: 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://patchthecve.com/cve/CVE-2018-15861.htmlhttps://patchthecve.com/cve/CVE-2018-15861.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: Unchecked NULL pointer usage in ExprResolveLhs 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 that triggers an xkb_intern_atom failure.https://patchthecve.com/cve/CVE-2018-15859.htmlhttps://patchthecve.com/cve/CVE-2018-15859.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs 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, because lookup failures are mishandled.https://patchthecve.com/cve/CVE-2018-15858.htmlhttps://patchthecve.com/cve/CVE-2018-15858.htmlWed, 17 Jun 2026 01:43:13 +0000MEDIUM 5.5: 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.https://patchthecve.com/cve/CVE-2018-15857.htmlhttps://patchthecve.com/cve/CVE-2018-15857.htmlWed, 17 Jun 2026 01:43:13 +0000HIGH 7.8: An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by supplying a crafted keymap file.https://patchthecve.com/cve/CVE-2018-15856.htmlhttps://patchthecve.com/cve/CVE-2018-15856.htmlWed, 17 Jun 2026 01:43:12 +0000MEDIUM 5.5: An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.https://patchthecve.com/cve/CVE-2018-15855.htmlhttps://patchthecve.com/cve/CVE-2018-15855.htmlWed, 17 Jun 2026 01:43:12 +0000MEDIUM 5.5: Unchecked NULL pointer usage 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, because the XkbFile for an xkb_geometry section was mishandled.https://patchthecve.com/cve/CVE-2018-15854.htmlhttps://patchthecve.com/cve/CVE-2018-15854.htmlWed, 17 Jun 2026 01:43:12 +0000MEDIUM 5.5: Unchecked NULL pointer usage 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, because geometry tokens were desupported incorrectly.https://patchthecve.com/cve/CVE-2018-15853.htmlhttps://patchthecve.com/cve/CVE-2018-15853.htmlWed, 17 Jun 2026 01:43:12 +0000MEDIUM 5.5: Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean negation.