CVE-2026-43500

Summary

In the Linux kernel, the following vulnerability has been resolved:rxrpc: Also unshare DATA/RESPONSE packets when paged frags are presentThe 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.

CWE-787Out-of-bounds Write

Attack profile

Affected products

• Linuxd0d5c0cd1e711c98703f3544c1e6fc1372898de5 to before 7c504ffab3efce8f7e4f463b314ae31030bdf18bd0d5c0cd1e711c98703f3544c1e6fc1372898de5 to before 3711382a77342a9a1c3d2e7330dcfc7ea927f568d0d5c0cd1e711c98703f3544c1e6fc1372898de5 to before 3eae0f4f9f7206a4801efa5e0235c25bbd5a412cd0d5c0cd1e711c98703f3544c1e6fc1372898de5 to before d45179f8795222ce858770dc619abe51f9d24411
• Linux5.3

References