CVE-2026-64355

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

bpf: Reject fragmented frames in devmap

Devmap broadcast redirects clone the packet for all but the last

destination.

For native XDP, that clone path copies only the linear xdp_frame data,

while fragmented frames keep skbsharedinfo in tailroom outside the

linear area. Cloning such a frame leaves XDPFLAGSHAS_FRAGS set but

without valid frag metadata, and the later free path can interpret

uninitialized tail data as skbsharedinfo, leading to an out-of-bounds

access during frame return.

Reject fragmented native XDP frames in devmapenqueue_clone().

Add the same restriction to the generic XDP clone path in

devmapredirect_clone(). Generic XDP represents fragmented packets as

nonlinear skbs, and rejecting them here keeps clone-based broadcast

support aligned between native and generic XDP.