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CVE-2026-80906

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : c2137d565ceb505de69593c181a0543bc4083838, <=6.1.*, <=6.12.*, 9ff46c36df2e0a1ac352f2f4038eaf3f0f7361b8, 5.15.217, <f9297abbcaba760b7a7b9d63b839f607f738013e, 0, <5479eb9b355f44745d7ccfe112386bd4f96eceea, <=7.1.*, 5.19, <=5.10.*, ad3f90a9c4a2c74bb3711f2031bffda4ec44c849, <5.10.266, 5.15.87, <=6.6.*, 5.4.229, 5.10.266, <01fdecc0480d916c799dbee584833a4a37e94d06, <fa86bc52ea8ba981f74f851fd61e2a3d3bc0feac, <5.5, <=6.18.*, <5.15.217, <6386a6ffa2efba2965ed8e4fa303582c0b76a215, 6.1.184, 7.1.10, dfed913e8b55a0c2c4906f1242fd38fd9a116e49, <5.19, 5.10.163, <e451e20adb869a983a21dda158625f024142e61f, <=*, <=5.15.*, 6.6.153, <6971cf319263d6a1b4096f9248aca9e57d77a1eb, 6.12.105, 6.18.46, <a4b82de96d465ddb44bc931145c0fa80c4fe9c9c, 7.2

Description

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.

Gravité et risque d'exploitation

CVE-2026-80906 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions c2137d565ceb505de69593c181a0543bc4083838, <=6.1.*, <=6.12.*, 9ff46c36df2e0a1ac352f2f4038eaf3f0f7361b8, 5.15.217, <f9297abbcaba760b7a7b9d63b839f607f738013e, 0, <5479eb9b355f44745d7ccfe112386bd4f96eceea, <=7.1.*, 5.19, <=5.10.*, ad3f90a9c4a2c74bb3711f2031bffda4ec44c849, <5.10.266, 5.15.87, <=6.6.*, 5.4.229, 5.10.266, <01fdecc0480d916c799dbee584833a4a37e94d06, <fa86bc52ea8ba981f74f851fd61e2a3d3bc0feac, <5.5, <=6.18.*, <5.15.217, <6386a6ffa2efba2965ed8e4fa303582c0b76a215, 6.1.184, 7.1.10, dfed913e8b55a0c2c4906f1242fd38fd9a116e49, <5.19, 5.10.163, <e451e20adb869a983a21dda158625f024142e61f, <=*, <=5.15.*, 6.6.153, <6971cf319263d6a1b4096f9248aca9e57d77a1eb, 6.12.105, 6.18.46, <a4b82de96d465ddb44bc931145c0fa80c4fe9c9c, 7.2) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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