CVE-2026-74616

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

xdp: reject clones that overrun skbsharedinfo tailroom

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

framesz to PAGESIZE. _xdpbuildskbfrom_frame() later treats that

page like a normal XDP frame and expects the usual skbsharedinfo

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, buildskbaround() places skbsharedinfo over live packet

bytes and later writes can corrupt XDP return metadata.

Reject clones unless their linear area fits inside

SKBWITHOVERHEAD(PAGE_SIZE), matching the tailroom requirement already

enforced by the XDP-to-skb conversion path.