FreeBSD 12.1-RELEASE Errata

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Last modified on 2021-01-21 19:31:07 -0500 by Glen Barber.

This document lists errata items for FreeBSD 12.1-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 12.1-RELEASE will be maintained until the release of FreeBSD 12.2-RELEASE.

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 12.1-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version of this errata document actually distributed with the release (for example, on a CDROM distribution) will be out of date by definition, but other copies are kept updated on the Internet and should be consulted as the current errata for this release.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 12-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-19:25.mcepce12 November 2019

Machine Check Exception on Page Size Change

FreeBSD-SA-19:26.mcu12 November 2019

Intel CPU Microcode Update

FreeBSD-SA-20:01.libfetch28 January 2020

fetch(3) buffer overflow

FreeBSD-SA-20:03.thrmisc28 January 2020

Kernel stack data disclosure

FreeBSD-SA-20:04.tcp18 March 2020

TCP IPv6 SYN cache kernel information disclosure

FreeBSD-SA-20:05.if_oce_ioctl18 March 2020

Insufficient ioctl(2) privilege checking

FreeBSD-SA-20:06.if_ixl_ioctl18 March 2020

Insufficient ioctl(2) privilege checking

FreeBSD-SA-20:07.epair18 March 2020

Incorrect user-controlled pointer use

FreeBSD-SA-20:08.jail18 March 2020

Kernel memory disclosure with nested jails

FreeBSD-SA-20:09.ntp18 March 2020

Multiple denial of service

FreeBSD-SA-20:10.ipfw21 April 2020

Invalid mbuf(9) handling

FreeBSD-SA-20:11.openssl21 April 2020

Remote denial of service

FreeBSD-SA-20:12.libalias12 May 2020

Insufficient packet length validation

FreeBSD-SA-20:13.libalias12 May 2020

Memory disclosure vulnerability

FreeBSD-SA-20:15.cryptodev12 May 2020

Use-after-free condition

FreeBSD-SA-20:16.cryptodev12 May 2020

Insufficient MAC key length check

FreeBSD-SA-20:17.usb9 June 2020

HID descriptor parsing error

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-20:25.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

FreeBSD-SA-20:33.openssl8 December 2019

NULL pointer de-reference

3. Errata Notices

FreeBSD-EN-19:19.loader12 November 2019

UEFI Loader Memory Fragmentation

FreeBSD-EN-20:01.ssp28 January 2020

Imprecise orderring of canary initialization

FreeBSD-EN-20:03.sshd18 March 2020

Misleading log messages upon successful login

FreeBSD-EN-20:05.mlx5en18 March 2020

Fix packet forwarding performance

FreeBSD-EN-20:06.ipv618 March 2020

Incorrect checksum calculations

FreeBSD-EN-20:07.quotad21 April 2020

Regression with certain NFS servers

FreeBSD-EN-20:08.tzdata12 May 2020

Timezone database update

FreeBSD-EN-20:09.igb12 May 2020

Fix failure to switch to inactive state

FreeBSD-EN-20:10.build12 May 2020

Incorrect build host clang version detection

FreeBSD-EN-20:11.ena9 June 2020

Stability issues in ena(4)

FreeBSD-EN-20:12.iflib9 June 2020

Watchdog timeout resetting idle queues

FreeBSD-EN-20:13.bhyve8 July 2020

Crash with PCI device passthrough

FreeBSD-EN-20:14.linuxkpi8 July 2020

Kernel panic

FreeBSD-EN-20:15.mps8 July 2020

Kernel panic

FreeBSD-EN-20:16.vmx5 August 2020

Packet loss and degraded performance

FreeBSD-EN-20:17.linuxthread2 September 2020

Kernel panic

FreeBSD-EN-20:19.audit1 December 2020

execve/fexecve system call auditing

FreeBSD-EN-20:20.tzdata1 December 2020

Timezone database information update

FreeBSD-EN-20:22.callout1 December 2020

Race condition in callout CPU migration

4. Open Issues

  • [2019-11-04] A late issue was discovered where systems using the graphics/drm-kmod port built on FreeBSD 12.0-RELEASE will crash during boot. It is advised to remove the port prior to upgrading, and build the port instead of using the upstream binary package.

5. Late-Breaking News

  • [2019-11-22] The FreeBSD 12.1-RELEASE announcement includes mention of FreeBSD/amd64 Amazon® EC2™ AMIs (Amazon Machine Images). Though it also included mention of FreeBSD/aarch64 being available in various regions, it had not passed third-party validation for inclusion in the Amazon® Marketplace.

    FreeBSD 12.1-RELEASE aarch64 Amazon® EC2™ AMIs are now available in the Marketplace here.