CVE-2026-74476: Linux

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: veth: convert frag_list skbs before running XDP A frag_list skb can reach veth with data_len set but nr_frags zero. veth_convert_skb_to_xdp_buff() only converts skbs that are shared, locked, have frags[], or do not have enough headroom. It later uses skb_is_nonlinear() to decide whether to set XDP_FLAGS_HAS_FRAGS and xdp_frags_size. That exposes frag_list data to XDP as if it were stored in frags[], but frags[] is empty. AF_XDP copy mode can then trust the bogus XDP fragment metadata, walk an empty fragment entry, and crash in memcpy() from __xsk_rcv(). Route non-linear skbs through skb_pp_cow_data() before exposing them to XDP, and only advertise XDP frags when the resulting skb has frags[]. skb_copy_bits() already handles frag_list input, and skb_pp_cow_data() builds frags[] output with skb_add_rx_frag(), which is the representation XDP multi-buffer expects.

Affected products

• Linux Linux: from 5.18, before 6.1.184 (fixed in 6.1.184); from 6.2, before 6.6.153 (fixed in 6.6.153); from 6.7, before 6.12.103 (fixed in 6.12.103); from 6.13, before 6.18.44 (fixed in 6.18.44); from 6.19, before 7.1.8 (fixed in 7.1.8)

Published 2026-08-15. Last modified 2026-08-23.