FreeBSD 11.4-RELEASE Errata

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Last modified on 2020-06-16 08:12:55 EDT by gjb.

This document lists errata items for FreeBSD 11.4-RELEASE, containing significant information discovered after the release or too late in the release cycle to be otherwise included in the release documentation. This information includes security advisories, as well as news relating to the software or documentation that could affect its operation or usability. An up-to-date version of this document should always be consulted before installing this version of FreeBSD.

This errata document for FreeBSD 11.4-RELEASE will be maintained until FreeBSD 11.4-RELEASE reaches end-of-life.

Table of Contents
1. Introduction
2. Security Advisories
3. Errata Notices
4. Open Issues
5. Late-Breaking News

1. Introduction

This errata document contains late-breaking news about FreeBSD 11.4-RELEASE. Before installing this version, it is important to consult this document to learn about any post-release discoveries or problems that may already have been found and fixed.

Any version of this errata document actually distributed with the release (for example, on a CDROM distribution) will be out of date by definition, but other copies are kept updated on the Internet and should be consulted as the current errata for this release. These other copies of the errata are located at, plus any sites which keep up-to-date mirrors of this location.

Source and binary snapshots of FreeBSD 11.4-STABLE also contain up-to-date copies of this document (as of the time of the snapshot).

For a list of all FreeBSD CERT security advisories, see

2. Security Advisories

FreeBSD-SA-20:18.posix_spawnp8 July 2020

Buffer overflow

FreeBSD-SA-20:19.unbound8 July 2020

Multiple vulnerabilities

FreeBSD-SA-20:20.ipv68 July 2020

Race condition and use-after-free

FreeBSD-SA-20:21.usb_net5 August 2020

Memory corruption

FreeBSD-SA-20:22.sqlite5 August 2020

Multiple vulnerabilities

FreeBSD-SA-20:23.sendmsg5 August 2020

Privilege escalation

FreeBSD-SA-20:24.ipv62 September 2020

Use-after-free bug

FreeBSD-SA-20:25.sctp2 September 2020

Use-after-free bug

FreeBSD-SA-20:26.dhclient2 September 2020

Heap overflow

FreeBSD-SA-20:27.ure15 September 2020

Packet-in-packet attack

FreeBSD-SA-20:28.bhyve_vmcs15 September 2020

Privilege escalation via VMCS

FreeBSD-SA-20:29.bhyve_svm15 September 2020

SVM guest escape

FreeBSD-SA-20:30.ftpd15 September 2020

Privilege escalation

FreeBSD-SA-20:31.icmp61 December 2019

Use-after-free in error message handling

FreeBSD-SA-20:32.rtsold1 December 2019

Multiple vulnerabilities

3. Errata Notices

FreeBSD-EN-20:15.mps8 July 2020

Kernel panic

FreeBSD-EN-20:17.linuxthread2 September 2020

Kernel panic

FreeBSD-EN-20:18.getfsstat2 September 2020

Kernel panic

FreeBSD-EN-20:20.tzdata1 December 2020

Timezone database information update

4. Open Issues

  • [2020-06-11] Source-based upgrades from FreeBSD 11.2 on the i386 architecture may fail to compile clang due to the amount of RAM consumed.

    Adding CFLAGS+=-O1 to /etc/make.conf or /etc/src.conf has been observed to work around the compile-time RAM exhaustion.

    See PR 246274 for additional details.

  • [2020-06-16] The FreeBSD 11.4 release notes erroneously state the KDE desktop environment has been updated to version The correct version is

5. Late-Breaking News

  • No late-breaking news.

This file, and other release-related documents, can be downloaded from

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For questions about this documentation, e-mail <>.