| Name | CVE-2018-15853 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 907302, 1122063 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| libxkbcommon (PTS) | bullseye | 1.0.3-2 | fixed |
| bookworm | 1.5.0-1 | fixed | |
| trixie | 1.7.0-2 | fixed | |
| forky, sid | 1.12.3-1 | fixed | |
| x11-xkb-utils (PTS) | bullseye | 7.7+5 | vulnerable |
| bookworm | 7.7+7 | vulnerable | |
| forky, sid, trixie | 7.7+9 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| libxkbcommon | source | (unstable) | 0.8.2-1 | low | 907302 | |
| x11-xkb-utils | source | (unstable) | (unfixed) | unimportant | 1122063 |
[stretch] - libxkbcommon <ignored> (Minor issue)
[jessie] - libxkbcommon <no-dsa> (Minor issue)
https://github.com/xkbcommon/libxkbcommon/commit/1f9d1248c07cda8aaff762429c0dce146de8632a
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html
https://www.openwall.com/lists/oss-security/2025/12/03/1
https://gitlab.freedesktop.org/xorg/app/xkbcomp/-/commit/da836764573298c53c625c6c237ab5211b2d3adf
For x11-xkb-utils/xkbcomp negligible security impact