CVE-2018-15859

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-08-25 · updated 2026-06-17
Weakness: CWE-476

Description

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.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04
Xkbcommon Libxkbcommon: through 0.8.1
Xkbcommon: through 0.8.1

References

https://access.redhat.com/errata/RHSA-2019:2079
https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html
https://security.gentoo.org/glsa/201810-05
https://usn.ubuntu.com/3786-1/
https://usn.ubuntu.com/3786-2/
https://access.redhat.com/errata/RHSA-2019:2079
https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html
https://security.gentoo.org/glsa/201810-05
https://usn.ubuntu.com/3786-1/
https://usn.ubuntu.com/3786-2/

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