CVE-2026-43500

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

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE

handler in rxrpc_verify_response() copy the skb to a linear one before

calling into the security ops only when skb_cloned() is true. An skb

that is not cloned but still carries externally-owned paged fragments

(e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via

__ip_append_data, or a chained skb_has_frag_list()) falls through to

the in-place decryption path, which binds the frag pages directly into

the AEAD/skcipher SGL via skb_to_sgvec().

Extend the gate to also unshare when skb_has_frag_list() or

skb_has_shared_frag() is true. This catches the splice-loopback vector

and other externally-shared frag sources while preserving the

zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC

page_pool RX, GRO). The OOM/trace handling already in place is reused.