CVE-2026-64077: netfilter: ebtables: move to two-stage removal scheme

CVE-2026-64077: netfilter: ebtables: move to two-stage removal scheme

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ebtables: move to two-stage removal scheme

Like previous patches for x_tables, follow same pattern in ebtables.
We can't reuse xt helpers: ebt_table struct layout is incompatible.

table->ops assignment is now done while still holding the ebt mutex
to make sure we never expose partially-filled table struct.

The Linux kernel CVE team has assigned CVE-2026-64077 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.15 with commit 87663c39f898b18905499126548da61450628682 and fixed in 6.18.34 with commit 739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1
	Issue introduced in 5.15 with commit 87663c39f898b18905499126548da61450628682 and fixed in 7.0.11 with commit ef395579a7631a06d61969fc712eb80402231b89
	Issue introduced in 5.15 with commit 87663c39f898b18905499126548da61450628682 and fixed in 7.1 with commit b7f0544d86d439cb946515d2ef6a0a75e8626710

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-64077
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/bridge/netfilter/ebtable_broute.c
	net/bridge/netfilter/ebtable_filter.c
	net/bridge/netfilter/ebtable_nat.c
	net/bridge/netfilter/ebtables.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1
	https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89
	https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710