CVE-2026-74616

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

xdp: reject clones that overrun skb_shared_info tailroom

xdpf_clone() clones broadcast copies into a single page and sets

frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that

page like a normal XDP frame and expects the usual skb_shared_info

tailroom at the end of the buffer.

The current check only rejects frames whose linear xdp_frame header,

headroom, and packet data exceed PAGE_SIZE. A source frame backed by a

larger allocation can still satisfy that check while extending into the

clone's required shared-info area. When such a clone is converted back

into an skb, build_skb_around() places skb_shared_info over live packet

bytes and later writes can corrupt XDP return metadata.

Reject clones unless their linear area fits inside

SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already

enforced by the XDP-to-skb conversion path.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References