CVE-2018-6920

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-05-08 · updated 2026-06-17
Weakness: CWE-200

Description

In FreeBSD before 11.1-STABLE(r332303), 11.1-RELEASE-p10, 10.4-STABLE(r332321), and 10.4-RELEASE-p9, due to insufficient initialization of memory copied to userland in the Linux subsystem and Atheros wireless driver, small amounts of kernel memory may be disclosed to userland processes. Unprivileged authenticated local users may be able to access small amounts of 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/104114
https://security.FreeBSD.org/advisories/FreeBSD-EN-18:05.mem.asc
http://www.securityfocus.com/bid/104114
https://security.FreeBSD.org/advisories/FreeBSD-EN-18:05.mem.asc

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