The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - net: tap: fix wrong transport_header when sending VLAN-tagged frame In tap_get_user_xdp(), when processing     a VLAN-tagged frame (e.g. ETH_P_8021Q), skb_set_network_header() is called first 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 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 the current 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_set_network_header() to after skb_probe_transport_header().
    At the time skb_probe_transport_header() is called, network_header still points to the VLAN header (offset     ETH_HLEN), so nhoff is correct and the flow dissector can parse the VLAN header, extract the inner     EtherType, and advance nhoff to the inner protocol header, allowing transport_header to be set correctly.
    (CVE-2026-80905)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
376443	Ubuntu 24.04 LTS / 26.04 LTS : Linux kernel vulnerabilities (USN-8959-1)	Nessus	Ubuntu Local Security Checks	11/5/2026	11/5/2026	high
342980	Linux Distros Unpatched Vulnerability : CVE-2026-80905	Nessus	Misc.	9/4/2026	11/6/2026	medium
351016	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-3139)	Nessus	Amazon Linux Local Security Checks	9/29/2026	10/8/2026	critical

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