Critical 9.4Published Jun 25, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:40 AM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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)`.

CVSS: 9.4 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4435888e1bf139d2bfe5911643d4217382136743; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 063f43361e884acd7300790e90194430275d0d0c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 726abf97566867f808fec9d8a408eb9698bd570a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 367abcacc13a8e2e7624408b7f593bd1e60e49d9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5d634afb8b83b49de562792fd0d047416a43bd4d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cea435ea7e868ea6fdf039bc4f2090c1d829b556; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 62443dc21114c0bbc476fa62973db89743f2f137	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 2.6.12; 2.6.12; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/4435888e1bf139d2bfe5911643d4217382136743	patch
https://git.kernel.org/stable/c/063f43361e884acd7300790e90194430275d0d0c	patch
https://git.kernel.org/stable/c/726abf97566867f808fec9d8a408eb9698bd570a	patch
https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9	patch
https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d	patch
https://git.kernel.org/stable/c/cea435ea7e868ea6fdf039bc4f2090c1d829b556	patch
https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.