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

  - xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe     directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later     paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did     not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared     pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for     uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb.
    Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back     to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place.
    Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP     output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without     calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len     is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag     path or fall back to skb_cow_data(). (CVE-2026-43284)

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Linux Distros Unpatched Vulnerability : CVE-2026-43284

high Nessus Plugin ID 313239

Version 1.9