FreeBSD The Power to Serve

FreeBSD 13.0-RELEASE Errata


This document lists errata items for FreeBSD 13.0-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 13.0-RELEASE will be maintained until the release of FreeBSD 13.1-RELEASE.


This errata document contains "late-breaking news" about FreeBSD 13.0-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version of this errata document actually distributed with the release (for example, on a CDROM distribution) will be out of date by definition, but other copies are kept updated on the Internet and should be consulted as the "current errata" for this release.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 13-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

Security Advisories

Advisory Date Topic


26 May 2021

Mitigation bypass


26 May 2021

Denial of service


24 August 2021

Missing error handling in bhyve(8) device models


24 August 2021

Remote code execution in ggatec(8)


24 August 2021

libfetch out of bounds read


24 August 2021

Multiple vulnerabilities in OpenSSL

Errata Notices

Errata Date Topic


26 May 2021

Kernel double free when transmitting on a divert socket


26 May 2021

mpt(4) I/O errors with a large maxphys value


26 May 2021

pms(4) data corruption


26 May 2021

virtio(4) device probing fails


26 May 2021

dc update


1 June 2021

Incorrect validation in rad_get_attr(3)


30 June 2021

Missing C++20 headers in libc++


30 June 2021

libcasper assertion failure


30 June 2021

Missing backwards compatibility in vlan(4)


30 June 2021

Kernel panic with ipfw link-layer filtering enabled


30 June 2021

Linux compatibility layer futex(2) system call vulnerability


24 August 2021

virtio_blk(4) fails to attach on some hypervisors


24 August 2021

OpenSSL 1.1.1e API functions not exported


24 August 2021

Fix NVMe iovec construction for large IOs

Open Issues

No open issues.

Late-Breaking News

[2021-04-05] A very late issue was discovered in the /usr/bin/dc program. The "P" command does not correctly pop the top of stack value and this will break complex scripts that continue after printing a result. The /usr/bin/bc program is not affected, since it does not depend on dc as its execution engine.

[2021-04-14] An issue was discovered where during an upgrade, when the kernel is new but /sbin/ifconfig is still the previous version, VLAN interfaces are configured with an invalid ethernet protocol type. This causes the VLAN interfaces to send invalid traffic, resulting in non-functional networking. Once the updated /sbin/ifconfig binary is installed, VLANs are created correctly. When depending on network access via VLANs during the upgrade, it is suggested to install the new world (run the second freebsd-update install) before rebooting.