CVE-2018-6917

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-04-04 · updated 2026-06-17
Weakness: CWE-190

Description

In FreeBSD before 11.1-STABLE, 11.1-RELEASE-p9, 10.4-STABLE, 10.4-RELEASE-p8 and 10.3-RELEASE-p28, insufficient validation of user-provided font parameters can result in an integer overflow, leading to the use of arbitrary kernel memory as glyph data. Unprivileged users may be able to access privileged kernel data.

Affected products

FreeBSD: from 10.0 before 10.4; from 11.0 before 11.1 — fixed in 10.4, 11.1

How to fix

Upgrade to a fixed version: FreeBSD 10.4, 11.1. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/103668
http://www.securitytracker.com/id/1040629
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:04.vt.asc
http://www.securityfocus.com/bid/103668
http://www.securitytracker.com/id/1040629
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:04.vt.asc

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