CVE-2026-53131
Received Received - Intake
Linux Kernel Ethernet Header Validation Bypass

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: kernel.org

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)`.
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Meta Information
Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-06-25
AI Q&A
2026-06-25
EPSS Evaluated
N/A
NVD
CVE-2026-53131
EUVD
EUVD-2026-39336
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves improper verification before accessing the Ethernet MAC header using the function eth_hdr(). Certain components like ip6t_eui64, xt_mac, various ipset types (bitmap:ip,mac; hash:ip,mac; hash:mac), and nf_log_syslog access eth_hdr(skb) assuming the skb (socket buffer) is associated with an Ethernet device or only partially checking the MAC header's location.

The issue is that these paths do not first verify that the skb is indeed associated with an Ethernet device, that the MAC header was properly set, and that it covers at least a full Ethernet header before accessing eth_hdr(skb). This could lead to incorrect or unsafe access to the MAC header.

Impact Analysis

If exploited, this vulnerability could cause the Linux kernel to access invalid or improperly verified memory areas when handling network packets. This might lead to kernel crashes, denial of service, or potentially allow attackers to manipulate network packet processing.

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