CVE-2026-53131

CriticalCVSS 9.4/10Last modified Oct 19, 2026

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)`.

Metrics

CVSS 3.1 9.4/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Weakness enumeration

CWE-125

Affected software

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4435888e1bf139d2bfe5911643d4217382136743; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 063f43361e884acd7300790e90194430275d0d0c; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 726abf97566867f808fec9d8a408eb9698bd570a; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 367abcacc13a8e2e7624408b7f593bd1e60e49d9; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5d634afb8b83b49de562792fd0d047416a43bd4d; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cea435ea7e868ea6fdf039bc4f2090c1d829b556; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 62443dc21114c0bbc476fa62973db89743f2f137
LinuxLinux2.6.12
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< *

References

Timeline

Published
Jun 25, 2026
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2026-53131: Critical severity, CVSS 9.4 | Vulnix