FreeBSD The Power to Serve

FreeBSD 11.4-RELEASE Release Notes


The release notes for FreeBSD 11.4-RELEASE contain a summary of the changes made to the FreeBSD base system on the 11.4-STABLE development line. This document lists applicable security advisories that were issued since the last release, as well as significant changes to the FreeBSD kernel and userland. Some brief remarks on upgrading are also presented.


This document contains the release notes for FreeBSD 11.4-RELEASE. It describes recently added, changed, or deleted features of FreeBSD. It also provides some notes on upgrading from previous versions of FreeBSD.

This distribution of FreeBSD 11.4-RELEASE is a release distribution. It can be found at or any of its mirrors. More information on obtaining this (or other) release distributions of FreeBSD can be found in the Obtaining FreeBSD' appendix to the FreeBSD Handbook.

All users are encouraged to consult the release errata before installing FreeBSD. The errata document is updated with "late-breaking" information discovered late in the release cycle or after the release. Typically, it contains information on known bugs, security advisories, and corrections to documentation. An up-to-date copy of the errata for FreeBSD 11.4-RELEASE can be found on the FreeBSD Web site.

This document describes the most user-visible new or changed features in FreeBSD since 11.2-RELEASE. In general, changes described here are unique to the 11.4-STABLE branch unless specifically marked as MERGED features.

Typical release note items document recent security advisories issued after 11.2-RELEASE, new drivers or hardware support, new commands or options, major bug fixes, or contributed software upgrades. They may also list changes to major ports/packages or release engineering practices. Clearly the release notes cannot list every single change made to FreeBSD between releases; this document focuses primarily on security advisories, user-visible changes, and major architectural improvements.

Upgrading from Previous Releases of FreeBSD

[amd64,i386] Binary upgrades between RELEASE versions (and snapshots of the various security branches) are supported using the freebsd-update(8&manpath=freebsd-release-ports[freebsd-update(8)) utility. The binary upgrade procedure will update unmodified userland utilities, as well as unmodified GENERIC kernels distributed as a part of an official FreeBSD release. The freebsd-update(8&manpath=freebsd-release-ports[freebsd-update(8)) utility requires that the host being upgraded have Internet connectivity.

Source-based upgrades (those based on recompiling the FreeBSD base system from source code) from previous versions are supported, according to the instructions in /usr/src/UPDATING.


Upgrading FreeBSD should only be attempted after backing up all data and configuration files.

Security and Errata

This section lists the various Security Advisories and Errata Notices since 11.2-RELEASE.

Security Advisories

Advisory Date Topic


24 July 2019

Multiple vulnerabilities


24 July 2019

Write-after-free vulnerability


24 July 2019

Kernel memory disclosure


24 July 2019

Reference count overflow


24 July 2019

xhci(4) out-of-bounds read


24 July 2019

Reference count leak


6 August 2019

Multiple vulnerabilities


6 August 2019

Out-of-bounds memory access


6 August 2019

Insufficient message length validation


6 August 2019

Insufficient validation of guest-supplied data


20 August 2019

IPv6 remove denial-of-service


20 August 2019

Kernel memory disclosure


20 August 2019

Reference count overflow


12 November 2019

Machine Check Exception on Page Size Change


12 November 2019

Intel CPU Microcode Update


28 January 2020

fetch(3) buffer overflow


28 January 2020

Kernel stack data disclosure


18 March 2020

TCP IPv6 SYN cache kernel information disclosure


18 March 2020

Insufficient ioctl(2) privilege checking


18 March 2020

Incorrect user-controlled pointer use


18 March 2020

Kernel memory disclosure with nested jails


18 March 2020

Multiple denial of service


21 April 2020

Invalid mbuf(9) handling


12 May 2020

Insufficient packet length validation


12 May 2020

Memory disclosure vulnerability


9 June 2020

HID descriptor parsing error

Errata Notices

Errata Date Topic


24 July 2019

System crash from Intel CPU vulnerability mitigation


6 August 2019

Incorrect exception handling


20 August 2019

Instruction emulation improvements


20 August 2019

"jail" keyword fix


23 October 2019

Timezone database information update


28 January 2020

Imprecise orderring of canary initialization


28 January 2020

Invalid pointer dereference


18 March 2020

Missing pfctl(8) tunable


18 March 2020

Incorrect checksum calculations


21 April 2020

Regression with certain NFS servers


This section covers changes and additions to userland applications, contributed software, and system utilities.

Userland Configuration Changes

The netatalk protocol has been removed from services(5). r358903

Userland Application Changes

The camcontrol(8) utility has been updated to include support for Accessible Max Address Configuration (AMA). r350801(Sponsored by iXsystems)

The camcontrol(8) utility has been updated to support block descriptors with the modepage subcommand. r351582

The yp(8) subsystem has been updated to increase the value of YPMAXRECORD from 1M to 16M for compatibility with Linux®. r351694(Sponsored by Mellanox Technologies)

The usbconfig(8) utility has been updated to include the detach_kernel_driver command. r351843

The jot(1) utility has been updated to allow an endless stream of random data within the specified bounds. r351873

The freebsd-update(8) utility has been updated to include two new commands, updatesready and showconfig. r352758

The cron(8) utility has been updated to support two new flags in crontab(5), -n and -q, which suppress mail on successful runs and suppress logging of command execution, respectively. r353134

The zfs(8) utility has been updated to support renaming bookmarks. r353759

The usbconfig(8) utility has been updated to include the dump_stats command. r356401

The fsck_ffs(8) and newfs(8) utilities has been updated to fix recovery information with sector sizes up to 64k. r356905

The certctl(8) utility has been added. r357082

The env(1) utility has been updated to include the -L and -U options, which are used to set the environment of the specified user from login.conf and ~/.login_conf, respectively. r357791

The syslogd(8) utility has been updated to add property-based filters. r359740

Contributed Software

The bzip2(1) utility has been updated to version 1.0.8. r351007

The WPA utilities have been updated to version 2.9. r351611

The tcsh(1) utility has been updated to version 6.21.0. r354195

The less(1) utility has been updated to version 551. r355504

The libbsdxml(3) library has been updated to version 2.2.9. r355604

OpenSSL has been update to version 1.0.2u. r356290

The pcap(3) library has been updated to version 1.9.1. r356341

The tcpdump(1) utility has been updated to version 4.9.3. r356341

The unbound(8) utility has been updated to version 1.9.6. r356345

The mtree(8) utility has been updated to include several bug fixes. r356533

The archive(3) library has been updated to version 3.4.2. r358088

The ntpd(8) utilities have been updated to version 4.2.8p14. r358659

The timezone database files have been updated to version 2020a. r360362

The file(1) utility has been updated to version 5.38. r360521

The xz(1) utility has been updated to version 5.2.5. r360523

The clang, llvm, lld, lldb, libunwind, openmp, compiler-rt utilities and libc++ have been updated to version 10.0.0. r360822

A fix to correctly link DTrace-enabled ports with lld has been added. r361217

Devices and Drivers

This section covers changes and additions to devices and device drivers since 11.3-RELEASE.

Device Drivers

The Kerberos GSS API has been updated to emit deprecation warnings for algorithms marked as "SHOULD NOT" be used in RFCs 6649 and 8429. r351243

The crypto(4) driver has been updated to emit deprecation warnings when the ARC4, Blowfish, CAST128, DES, 3DES, MD5-HMAC, and Skipjack algorithms are used. r351246

The ubsec(4) driver has been marked as deprecated, and will be removed in FreeBSD 13.0. r361049

Storage Drivers

The aacraid(4) driver has been updated to version 3.2.10. r354965

Support for JMicron® JMB582 and JMB585 AHCI controllers has been added. r359971

Network Drivers

Support for the D-Link® DWM-222 LTE dongle has been added. r359258

The ng_nat(4) driver has been updated to allow attaching to an ethernet interface. r359698

The ena(4) driver has been updated to version 2.2.0. r361539 (Sponsored by Amazon, Inc.)

Hardware Support

This section covers general hardware support for physical machines, hypervisors, and virtualization environments, as well as hardware changes and updates that do not otherwise fit in other sections of this document.

Hardware Support

Support for Intel® Cannon Lake PCH has been added to snd_hda(4). r359114


This section covers changes and additions to file systems and other storage subsystems, both local and networked.


Latency of synchronous 128KB writes has been improved. r353583

Support for renaming ZFS bookmarks has been added. r353759

The ZFS ZIL (ZFS intent log) maximum block size is now tunable. r359554


This section describes changes that affect networking in FreeBSD.

Network Protocols

The libalias(3) library and ipfw(4) packet filter have been updated to add support for RFC 6598/Carrier Grade NAT subnets. r359695

Ports Collection and Package Infrastructure

This section covers changes to the FreeBSD Ports Collection, package infrastructure, and package maintenance and installation tools.

Packaging Changes

The pkg(8) utility has been updated to version 1.13.2.

The GNOME desktop environment has been updated to version 3.28.

The KDE desktop environment has been updated to version

Last modified on: June 19, 2021 by Danilo G. Baio