CVE-2026-43500 - rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

CVE-2026-43500 - rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

https://cvefeed.io/rssfeed/latest.atom / Mon, 05/11/2026 - 11:23
CVE ID :CVE-2026-43500
Published : May 11, 2026, 8:16 a.m. | 1 hour, 2 minutes ago
Description :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.
Severity: 0.0 | NA
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