CVE-2026-53001 netfilter: xtables: restrict several matches to inet family
Attackers can bypass netfilter restrictions by using specific matches on unsupported network families, requiring kernel patches to enforce correct family restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53001?
CVE-2026-53001 is a medium-severity missing authorization vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xtables: restrict several matches to inet family
This is a partial revert of:
commit ab4f21e6fb1c ("netfilter: xtables: use NFPROTO_UNSPEC in more extensions")
to allow ipv4 and ipv6 only.
- xt_mac - xt_owner - xt_physdev
These extensions are not used by ebtables in userspace.
Moreover, xt_realm is only for ipv4, since dst->tclassid is ipv4 specific.
Which versions are affected by CVE-2026-53001?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53001?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53001 being exploited?
There is no known exploitation of CVE-2026-53001 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53001, DEBIAN-CVE-2026-53001, GHSA-5r9g-xr89-8v73, ROOT-OS-UBUNTU-2204-CVE-2026-53001, ROOT-OS-UBUNTU-2404-CVE-2026-53001, UBUNTU-CVE-2026-53001.