CVE-2026-53131

netfilter: require Ethernet MAC header before using eth_hdr()

State: Published
Severity: 9.4 Critical
Published: Jun 25, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 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)`.

Scores

CVSS	Score	Vector	Source
3.1	9.4 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4435888e1bf139d2bfe5911643d4217382136743Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 063f43361e884acd7300790e90194430275d0d0cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 726abf97566867f808fec9d8a408eb9698bd570aAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 367abcacc13a8e2e7624408b7f593bd1e60e49d9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5d634afb8b83b49de562792fd0d047416a43bd4dAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before cea435ea7e868ea6fdf039bc4f2090c1d829b556Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 62443dc21114c0bbc476fa62973db89743f2f137Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4435888e1bf139d2bfe5911643d4217382136743Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 063f43361e884acd7300790e90194430275d0d0cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 726abf97566867f808fec9d8a408eb9698bd570aAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 367abcacc13a8e2e7624408b7f593bd1e60e49d9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5d634afb8b83b49de562792fd0d047416a43bd4dAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before cea435ea7e868ea6fdf039bc4f2090c1d829b556Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 62443dc21114c0bbc476fa62973db89743f2f137Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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