CVE-2026-80906 (GCVE-0-2026-80906)
Vulnerability from cvelistv5
Published
2026-09-04 17:19
Modified
2026-09-04 17:19
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: packet: fix wrong transport_header when sending VLAN-tagged frame
In packet_parse_headers(), when processing a VLAN-tagged frame,
skb_set_network_header() is called to advance network_header past the
VLAN tag to the inner protocol header. skb_probe_transport_header() is
then called with skb->protocol still set to the outer VLAN EtherType
(e.g. ETH_P_8021Q), while nhoff (derived from skb_network_offset())
already points past the VLAN tag to the inner protocol header.
In __skb_flow_dissect(), proto is initialized to ETH_P_8021Q and nhoff
points past the VLAN tag. When the dissector hits case ETH_P_8021Q, it
reads a struct vlan_hdr at nhoff via __skb_header_pointer(), but that
offset contains the inner protocol header (e.g. an IP header). The bytes
are misinterpreted as a VLAN header, yielding a garbage encapsulated
EtherType that matches no known protocol. The dissector returns false,
so skb_probe_transport_header() never calls skb_set_transport_header(),
leaving transport_header at its uninitialized sentinel value (~0U).
Move skb_probe_transport_header() to before skb_set_network_header(). At
the time skb_probe_transport_header() is called, network_header still
points to the VLAN header, so nhoff correctly points to the VLAN header.
The flow dissector can then parse the VLAN header, extract the inner
EtherType, and advance nhoff to the inner protocol header, allowing
transport_header to be set correctly.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c2137d565ceb505de69593c181a0543bc4083838 Version: 9ff46c36df2e0a1ac352f2f4038eaf3f0f7361b8 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: dfed913e8b55a0c2c4906f1242fd38fd9a116e49 Version: ad3f90a9c4a2c74bb3711f2031bffda4ec44c849 Version: 5.10.163 ≤ Version: 5.15.87 ≤ Version: 5.4.229 ≤ |
||
{
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: packet: fix wrong transport_header when sending VLAN-tagged frame\n\nIn packet_parse_headers(), when processing a VLAN-tagged frame,\nskb_set_network_header() is called to advance network_header past the\nVLAN tag to the inner protocol header. skb_probe_transport_header() is\nthen called with skb-\u003eprotocol still set to the outer VLAN EtherType\n(e.g. ETH_P_8021Q), while nhoff (derived from skb_network_offset())\nalready points past the VLAN tag to the inner protocol header.\n\nIn __skb_flow_dissect(), proto is initialized to ETH_P_8021Q and nhoff\npoints past the VLAN tag. When the dissector hits case ETH_P_8021Q, it\nreads a struct vlan_hdr at nhoff via __skb_header_pointer(), but that\noffset contains the inner protocol header (e.g. an IP header). The bytes\nare misinterpreted as a VLAN header, yielding a garbage encapsulated\nEtherType that matches no known protocol. The dissector returns false,\nso skb_probe_transport_header() never calls skb_set_transport_header(),\nleaving transport_header at its uninitialized sentinel value (~0U).\n\nMove skb_probe_transport_header() to before skb_set_network_header(). At\nthe time skb_probe_transport_header() is called, network_header still\npoints to the VLAN header, so nhoff correctly points to the VLAN header.\nThe flow dissector can then parse the VLAN header, extract the inner\nEtherType, and advance nhoff to the inner protocol header, allowing\ntransport_header to be set correctly."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T17:19:16.531Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a4b82de96d465ddb44bc931145c0fa80c4fe9c9c"
},
{
"url": "https://git.kernel.org/stable/c/fa86bc52ea8ba981f74f851fd61e2a3d3bc0feac"
},
{
"url": "https://git.kernel.org/stable/c/5479eb9b355f44745d7ccfe112386bd4f96eceea"
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{
"url": "https://git.kernel.org/stable/c/e451e20adb869a983a21dda158625f024142e61f"
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{
"url": "https://git.kernel.org/stable/c/6971cf319263d6a1b4096f9248aca9e57d77a1eb"
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{
"url": "https://git.kernel.org/stable/c/f9297abbcaba760b7a7b9d63b839f607f738013e"
},
{
"url": "https://git.kernel.org/stable/c/6386a6ffa2efba2965ed8e4fa303582c0b76a215"
},
{
"url": "https://git.kernel.org/stable/c/01fdecc0480d916c799dbee584833a4a37e94d06"
}
],
"title": "net: packet: fix wrong transport_header when sending VLAN-tagged frame",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80906",
"datePublished": "2026-09-04T17:19:16.531Z",
"dateReserved": "2026-08-26T14:34:25.800Z",
"dateUpdated": "2026-09-04T17:19:16.531Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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