CriticalFix available

veth: convert frag_list skbs before running XDP

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.184, 6.12.103, 6.18.44, 6.6.153, 7.1.8
CVEs: CVE-2026-74476
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 17:39 UTC · Revision 1

Source evidence

veth: convert frag_list skbs before running XDP

core-osv · Original source

Published 15 Aug 2026, 12:27 UTC

osv:CVE-2026-74476

Kernel

Fixed versions: 6.1.184, 6.6.153, 6.12.103, 6.18.44, 7.1.8

Complete source record

{
  "id": "7d908d79bcb81417cc5d09b8227bac9cf43440e3453b9795faedc1ee29d07a5c",
  "url": "https://osv.dev/vulnerability/CVE-2026-74476",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "veth: convert frag_list skbs before running XDP",
    "summary": "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.",
    "evidence": "osv:CVE-2026-74476",
    "products": [
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        "name": {
          "value": "Kernel",
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        "fixed_versions": [
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            "value": "6.1.184",
            "evidence": "/affected/1/ranges"
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    "severity": "critical",
    "structured": {
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      "aliases": [
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      "metrics": [
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          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
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      "affected": [
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:37.887811500Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/04958dba44dc795dc79ce2fcbc117821bbbd6542",
        "https://git.kernel.org/stable/c/0be3632597b8349d43a7dc4244b492dc62a05998",
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        "https://git.kernel.org/stable/c/f9c1fff857e93be709c8b52ed1a643f37bd82c66",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74476.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74476",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
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    "related_cves": [
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    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505389,
  "published_at": "2026-08-15T12:27:11.309+00:00"
}