CVE-2026-53131 netfilter: require Ethernet MAC header before using eth_hdr()

What is CVE-2026-53131?

CVE-2026-53131 is a critical vulnerability in Linux kernel, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

netfilter: require Ethernet MAC header before using eth_hdr()

`ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and `hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)` after either assuming that the skb is associated with an Ethernet device or checking only that the `ETH_HLEN` bytes at `skb_mac_header(skb)` lie between `skb->head` and `skb->data`.

Make these paths first verify that the skb is associated with an Ethernet device, that the MAC header was set, and that it spans at least a full Ethernet header before accessing `eth_hdr(skb)`.

Weakness: CWE-125

Which versions are affected by CVE-2026-53131?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53131?

Apply the vendor's patch.

Is CVE-2026-53131 being exploited?

There is no known exploitation of CVE-2026-53131 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-90636, BELL-CVE-2026-53131, DEBIAN-CVE-2026-53131, GHSA-8cg3-6h68-w2cj, ROOT-OS-DEBIAN-11-CVE-2026-53131, ROOT-OS-DEBIAN-12-CVE-2026-53131 and 10 more.