CVE-2026-74476
CVE CVE-2026-74476EUVD EUVD-2026-59669Published 2026-08-15T12:27:11.000ZLast changed 2026-08-17T05:47:37.000ZCVSS 9.1
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; patch: 6.12.103; patch: 6.18.44; 5.18; 718a18a0c8a67f97781e40bdef7cdd055c430996 <b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb; 718a18a0c8a67f97781e40bdef7cdd055c430996 <f9c1fff857e93be709c8b52ed1a643f37bd82c66; 718a18a0c8a67f97781e40bdef7cdd055c430996 <5c1c15c540fc45820ce3033c319151ec891bc10a; patch: 7.1.8; 718a18a0c8a67f97781e40bdef7cdd055c430996 <d0d6415963040c401e7a7e4e482a698ba52448cb; patch: 7.2
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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