CVE-2026-74476veth: convert frag_list skbs before running XDP
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 718a18a0c8a67f97781e40bdef7cdd055c430996 builds before 0be3632597b8349d43a7dc4244b492dc62a05998; from 718a18a0c8a67f97781e40bdef7cdd055c430996 before 04958dba44dc795dc79ce2fcbc117821bbbd6542; 718a18a0c8a67f97781e40bdef7cdd055c430996 builds before 5c1c15c540fc45820ce3033c319151ec891bc10a; from 718a18a0c8a67f97781e40bdef7cdd055c430996 before b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb; from 718a18a0c8a67f97781e40bdef7cdd055c430996 before f9c1fff857e93be709c8b52ed1a643f37bd82c66; from 718a18a0c8a67f97781e40bdef7cdd055c430996 before d0d6415963040c401e7a7e4e482a698ba52448cb | CNA record |
References
- https://git.kernel.org/stable/c/0be3632597b8349d43a7dc4244b492dc62a05998
- https://git.kernel.org/stable/c/04958dba44dc795dc79ce2fcbc117821bbbd6542
- https://git.kernel.org/stable/c/5c1c15c540fc45820ce3033c319151ec891bc10a
- https://git.kernel.org/stable/c/b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb
- https://git.kernel.org/stable/c/f9c1fff857e93be709c8b52ed1a643f37bd82c66
- https://git.kernel.org/stable/c/d0d6415963040c401e7a7e4e482a698ba52448cb
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.