FreeBSD Errata Notice FreeBSD-EN-25:13.wlan_tkip
8 August, 2025 by errata-notices@freebsd.org | freebsd
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FreeBSD-EN-25:13.wlan_tkip Errata Notice
The FreeBSD Project
Topic: net80211 TKIP crypto support fails for some drivers
Category: core
Module: wlan_tkip
Announced: 2025-08-08
Credits: Adrian Chadd
Affects: FreeBSD 14.3
Corrected: 2025-06-10 23:45:16 UTC (stable/14, 14.3-STABLE)
2025-08-08 00:39:03 UTC (releng/14.3, 14.3-RELEASE-p2)
For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.
I. Background
In order to support Temporal Key Integrity Protocol (TKIP) on modern wireless
chipsets, the net80211 wireless stack was adjusted to skip certain crypto
operations if a driver indicated that they were already done by hardware.
II. Problem Description
One adjustment erroneously changed a default for an operation from opt-in
to opt-out.
III. Impact
Older drivers may not pass flags to either opt-in or opt-out and thus
one TKIP operations is no longer executed for them given the changed
default. This leads to non-working wireless connections.
IV. Workaround
Users still using TKIP are highly advised to change their Cipher Suite
to CCMP as TKIP is no longer considered secure and has been deprecated
since 2012.
No other workaround is available. Systems using CCMP are unaffected.
V. Solution
Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date and reboot.
Perform one of the following:
1) To update your system via a binary patch:
Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms,
can be updated via the freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
# shutdown -r +10min "Rebooting for erratum update"
2) To update your system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/EN-25:13/wlan_tkip.patch
# fetch https://security.FreeBSD.org/patches/EN-25:13/wlan_tkip.patch.asc
# gpg --verify wlan_tkip.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
VI. Correction details
This issue is corrected as of the corresponding Git commit hash in the
following stable and release branches:
Branch/path Hash Revision
- -------------------------------------------------------------------------
stable/14/ 950343a170f0 stable/14-n271651
releng/14.3/ a3bd81ddfe29 releng/14.3-n271436
- -------------------------------------------------------------------------
Run the following command to see which files were modified by a
particular commit:
# git show --stat <commit hash>
Or visit the following URL, replacing NNNNNN with the hash:
<URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>
To determine the commit count in a working tree (for comparison against
nNNNNNN in the table above), run:
# git rev-list --count --first-parent HEAD
VII. References
<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id(8009>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-25:13.wlan_tkip.asc>
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