Answer in brief
CVE-2026-74476 records a Critical severity (CVSS 9.1) vulnerability in veth: convert frag_list skbs before running XDP. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=718a18a0c8a67f97781e40bdef7cdd055c430996 <5c1c15c540fc45820ce3033c319151ec891bc10a || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <f9c1fff857e93be709c8b52ed1a643f37bd82c66 || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <d0d6415963040c401e7a7e4e482a698ba52448cb | 5c1c15c540fc45820ce3033c319151ec891bc10a, b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb, f9c1fff857e93be709c8b52ed1a643f37bd82c66, d0d6415963040c401e7a7e4e482a698ba52448cb |
| Linux/Linuxgeneric | 5.18 | Not reported |
| Linux/Linuxgeneric | >=718a18a0c8a67f97781e40bdef7cdd055c430996 <0be3632597b8349d43a7dc4244b492dc62a05998 || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <04958dba44dc795dc79ce2fcbc117821bbbd6542 || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <5c1c15c540fc45820ce3033c319151ec891bc10a || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <f9c1fff857e93be709c8b52ed1a643f37bd82c66 || >=718a18a0c8a67f97781e40bdef7cdd055c430996 <d0d6415963040c401e7a7e4e482a698ba52448cb | 0be3632597b8349d43a7dc4244b492dc62a05998, 04958dba44dc795dc79ce2fcbc117821bbbd6542, 5c1c15c540fc45820ce3033c319151ec891bc10a, b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb, f9c1fff857e93be709c8b52ed1a643f37bd82c66, d0d6415963040c401e7a7e4e482a698ba52448cb |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.