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FreeBSD-EN-26:08.pf                                             Errata Notice
                                                          The FreeBSD Project

Topic:          Incorrect duplicate rule detection for automatic tables

Category:       core
Module:         pf
Announced:      2026-04-29
Credits:        Michael Sinatra
Affects:        FreeBSD 15.0
Corrected:      2026-04-26 10:12:28 UTC (stable/15, 15.0-STABLE)
                2026-04-29 14:48:24 UTC (releng/15.0, 15.0-RELEASE-p7)

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

pf is an Internet Protocol packet filter originally written for OpenBSD.
While loading its configuration, pf hashes rules and silently drops
duplicates as an optimisation.  Only the first rule with the same hash is
considered.

II.  Problem Description

While checking for duplicate rules pf did not distinguish automatically
created tables from each other.  As a result some of those rules may have
unexpectedly not been loaded.

III. Impact

The ruleset loaded in the kernel might not match the configured ruleset.

IV.  Workaround

This problem only affects rules with tables created by the pfctl rules
optimiser.  Either disable ruleset optimisation ('set ruleset-optimization
none'), or avoid constructs which would be optimisised into a table (e.g. by
manually creating such tables).

V.   Solution

Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date, and reboot the system.

Perform one of the following:

1) To update your system installed from base system packages:

Systems running a 15.0-RELEASE version of FreeBSD on the amd64 or arm64
platforms, which were installed using base system packages, can be updated
via the pkg(8) utility:

# pkg upgrade -r FreeBSD-base
# shutdown -r now

2) To update your system installed from binary distribution sets:

Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms,
or the i386 platform on FreeBSD 13, which were not installed using base
system packages, can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install
# shutdown -r now

3) 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-26:08/pf.patch
# fetch https://security.FreeBSD.org/patches/EN-26:08/pf.patch.asc
# gpg --verify pf.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/15/                              fdcc60f52841    stable/15-n283345
releng/15.0/                            d91d13c12484  releng/15.0-n281025
- -------------------------------------------------------------------------

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

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-26:08.pf.asc>
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