CVE-2026-43329

Status: UPDATED  |  Advisory ID: CVE-2026-43329

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

netfilter: flowtable: strictly check for maximum number of actions

The maximum number of flowtable hardware offload actions in IPv6 is:

* ethernet mangling (4 payload actions, 2 for each ethernet address)

* SNAT (4 payload actions)

* DNAT (4 payload actions)

* Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing)

for QinQ.

* Redirect (1 action)

Which makes 17, while the maximum is 16. But act_ct supports for tunnels

actions too. Note that payload action operates at 32-bit word level, so

mangling an IPv6 address takes 4 payload actions.

Update flow_action_entry_next() calls to check for the maximum number of

supported actions.

While at it, rise the maximum number of actions per flow from 16 to 24

so this works fine with IPv6 setups. (NVD)

What to Do

Monitor Linux's and Red Hat's web pages for any future patch releases.

References