FreeBSD The Power to Serve

FreeBSD 10.4-RELEASE Errata


This document lists errata items for FreeBSD 10.4-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 10.4-RELEASE will be maintained until the release of FreeBSD 10.4-RELEASE.


This errata document contains "late-breaking news" about FreeBSD 10.4-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version of this errata document actually distributed with the release (for example, on a CDROM distribution) will be out of date by definition, but other copies are kept updated on the Internet and should be consulted as the "current errata" for this release.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 10.4-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

Security Advisories

Advisory Date Topic


10 August 2017

Denial of Service vulnerability


16 October 2017

WPA2 protocol vulnerability


15 November 2017

Kernel data leak via ptrace(PT_LWPINFO)


15 November 2017

POSIX shm allows jails to access global namespace


15 November 2017

Information leak


29 November 2017

Multiple vulnerabilities


09 December 2017

Multiple vulnerabilities


07 March 2018

Fix IPSEC validation and use-after-free


07 March 2018

Multiple vulnerabilities


04 April 2018

Fix vt(4) console memory disclosure


04 April 2018

Fix denial of service


08 May 2018

Mishandling of x86 debug exceptions


06 August 2018

Resource exhaustion in TCP reassembly


14 August 2018

L1 Terminal Fault (L1TF) Kernel Information Disclosure


14 August 2018

Resource exhaustion in IP fragment reassembly


14 August 2018

Unauthenticated EAPOL-Key Decryption Vulnerability


12 September 2018

Improper ELF header parsing

Errata Notices

Errata Date Topic


2 November 2017

Timezone database information update


07 March 2018

Timezone database information update


07 March 2018

Stack-based buffer overflow


04 April 2018

Update timezone database information


04 April 2018

Multiple small kernel memory disclosures


08 May 2018

Multiple small kernel memory disclosures


08 May 2018

Update timezone database information


27 September 2018

Denial of service in listen system call


27 September 2018

Small kernel memory disclosures in two system calls

Open Issues

  • FreeBSD/i386 10.4-RELEASE running as a guest operating system on VirtualBox can have a problem with disk I/O access. It depends on some specific hardware configuration and does not depend on a specific version of VirtualBox or host operating system.

    It has been reported that instability may be present on virtual machines running on other hypervisors, such as Xen or KVM.

    It causes various errors and makes FreeBSD quite unstable. Although the cause is still unclear, disabling unmapped I/O works as a workaround. To disable it, choose Escape to loader prompt in the boot menu and enter the following lines from loader(8) prompt, after an OK:

    set vfs.unmapped_buf_allowed=0

    Note that the following line has to be added to /boot/loader.conf after a boot. It disables unmapped I/O at every boot:

  • FreeBSD/i386 10.4-RELEASE installed on ZFS may crash during boot when the ZFS pool mount is attempted while booting an unmodified GENERIC kernel.

    As described in /usr/src/UPDATING entry 20121223, rebuilding the kernel with options KSTACK_PAGES=4 has been observed to resolve the boot-time crash. This, however, is not an ideal solution for inclusion in the GENERIC kernel configuration, as increasing KSTACK_PAGES implicitly decreases available usermode threads in an environment that is already resource-starved.

    Taking into account the heavy resource requirements of ZFS, in addition to the i386-specific tuning requirements for general workloads, using ZFS with the FreeBSD/i386 GENERIC kernel is strongly discouraged.

    If installing FreeBSD/i386 on ZFS, it is possible to configure the system after installation to increase the KSTACK_PAGES.

    When prompted by bsdinstall(8) to perform additional post-installation configuration to the system, select [ YES ].

    This procedure requires the system sources available locally. If the System source code distribution was not selected during installation, it can be obtained using svnlite:

    # mkdir -p /usr/src
    # svnlite co /usr/src

    Build the kernel-toolchain required to rebuild the kernel:

    # make -C /usr/src kernel-toolchain

    Next, create a kernel configuration file to increase the KSTACK_PAGES option:

    # printf "include GENERIC\noptions KSTACK_PAGES=4\n" > /usr/src/sys/i386/conf/ZFS

    Then build and install the `ZFS` kernel:

    # make -C /usr/src buildkernel KERNCONF=ZFS
    # make -C /usr/src installkernel KERNCONF=ZFS

    It is extremely important to take note that, by default, freebsd-update(8) will install the GENERIC kernel configuration, and as such, freebsd-update(8) consumers are strongly encouraged to avoid FreeBSD-provided kernel binary upgrades with such configurations.

  • Due to an incompatibility between bsdconfig(8) and pkg(8), packages included on the FreeBSD dvd installer will not be recognized by bsdconfig(8).

    To install packages from the dvd1.iso installer, create the /dist target directory, and manually mount the dvd1.iso ISO:

    # mkdir -p /dist
    # mount -t cd9660 /dev/cd0 /dist

    Be sure to use the correct /dev device path for the dvd1.iso ISO installer.

    Next, set REPOS_DIR to the path of the repos/ directory within the installer so pkg(8) will use the correct repository metadata.

    If using sh(1):

    # export REPOS_DIR=/dist/packages/repos

    If using csh(1):

    # setenv REPOS_DIR /dist/packages/repos

    Keep in mind that REPOS_DIR will need to be set again after the current shell session is terminated, if continuing to use the packages provided on the dvd1.iso installer.

    Finally, bootstrap pkg(8) from the ISO, and install required packages:

    # pkg bootstrap
    # pkg install xorg-server xorg gnome3 [...]
  • An issue with FreeBSD virtual machines with vagrant was discovered that affects the VirtualBox where the virtual machine will not start on the initial boot invoked with vagrant up.

    The issue is due to the virtual machine MAC being unset, as FreeBSD does not provide a default Vagrantfile.

    It has been observed, however, that a subsequent invocation of vagrant up will allow the virtual machine to successfully boot, allowing access via vagrant ssh.

Late-Breaking News

No news.

Last modified on: January 26, 2021 by Sergio Carlavilla Delgado