CVE-2026-53131

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)`.

References

• https://git.kernel.org/stable/c/063f43361e884acd7300790e90194430275d0d0c
• https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9
• https://git.kernel.org/stable/c/4435888e1bf139d2bfe5911643d4217382136743
• https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d
• https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137