PT-2026-52361 · Linux · Linux
Publicado
2026-06-25
·
Atualizado
2026-06-25
·
CVE-2026-53266
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In the Linux kernel, the following vulnerability has been resolved:
netfilter: bridge: make ebt snat ARP rewrite writable
The ebtables SNAT target keeps the Ethernet source address rewrite
behind skb ensure writable(skb, 0). This is intentional: at the bridge
ebtables hooks the Ethernet header is addressed through
skb mac header()/eth hdr(), while skb->data points at the Ethernet
payload. Asking skb ensure writable() for ETH HLEN bytes would check
the payload, not the Ethernet header, and would reintroduce the small
packet regression fixed by commit 63137bc5882a.
However, the optional ARP sender hardware address rewrite is different.
It writes through skb store bits() at an offset relative to skb->data:
skb store bits(skb, sizeof(struct arphdr), info->mac, ETH ALEN)skb header pointer() only safely reads the ARP header; it does not make
the later sender hardware address range writable. If that range is
still held in a nonlinear skb fragment backed by a splice-imported file
page, skb store bits() maps the frag page and copies the new MAC address
directly into it.
Ensure the ARP SHA range is writable before reading the ARP header and
before calling skb store bits().
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