Use After Free in Xkbcommon Libxkbcommon
CVE-2018-15857
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Xkbcommon Libxkbcommon
- Xkbcommon
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Weakness classification (CWE)
References
- security.gentoo.org/glsa/201810-05 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3786-1/ (vendor-advisory, Third Party Advisory)
- github.com/xkbcommon/libxkbcommon/commit/c1e5ac16e77a21f87bdf3bc4dea61b037a17dd… (Patch, Third Party Advisory)
- usn.ubuntu.com/3786-2/ (vendor-advisory, Third Party Advisory)
- lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html (Patch, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:2079 (vendor-advisory)
Frequently asked questions
- What is CVE-2018-15857?
- CVE-2018-15857 is a high-severity vulnerability in Xkbcommon Libxkbcommon, classified under Use After Free. CVSS score: 7.8/10. Published 2018-08-25.
- How severe is CVE-2018-15857?
- High severity. CVSS v3 base score is 7.8 out of 10.