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

  - xsk: reclaim invalid Tx descriptors in ZC batch path The zero-copy Tx batch parser stops when it     encounters an invalid descriptor. If this happens after one or more continuation descriptors, the Tx     consumer can be advanced past fragments that are neither submitted to the driver nor returned to userspace     through the completion ring. A similar problem occurs when a packet exceeds xdp_zc_max_segs. The     descriptors consumed up to the limit are released without completion, and the remaining continuation     descriptors can subsequently be interpreted as the beginning of another packet. Parse Tx batches in packet     units and distinguish descriptors belonging to complete valid packets from descriptors consumed while     draining an invalid or oversized packet. Return the former to the driver and append the latter to the CQ     address area so userspace can reclaim their UMEM frames. Treat a standalone invalid descriptor as a one-     descriptor reclaim-only packet. Advancing the Tx-ring consumer releases the ring slot, but does not by     itself return ownership of the referenced UMEM frame to userspace. Once draining starts, continue until     the packet's end-of-packet descriptor is consumed. Preserve the drain state on the socket when EOP has not     yet been supplied, so draining can continue during a later call. Leave incomplete but otherwise valid     packets on the Tx ring. Shared-UMEM pools using multi-buffer Tx also need packet-framed parsing. Walk     their Tx sockets one packet at a time, preserving the existing per-socket fairness scheme, instead of     using the legacy one-descriptor fallback. Keep that fallback for shared pools that do not use multi-buffer     Tx. Since the drain state is maintained per socket and both the singular and shared paths can resume an     interrupted drain, changing the socket list from singular to shared requires no special bind-time     transition. CQ entries are positional, and drivers may complete only part of the Tx work returned by     xsk_tx_peek_release_desc_batch(). Therefore, reclaim-only entries cannot be published immediately when     earlier driver-visible descriptors are still outstanding. Track the number of driver-visible CQ entries     preceding the reclaim entries. Let xsk_tx_completed() publish partial hardware Tx completions, and publish     the reclaim entries only after every earlier Tx descriptor has completed. Complete a reclaim-only batch     immediately when there is no driver-visible work in front of it, and prevent another Tx batch from being     appended while reclaim entries remain pending. Also cap batch processing by the size of the pool's     temporary descriptor array, as Tx rings belonging to sockets sharing a UMEM may have different sizes. This     ensures that every invalid Tx descriptor consumed by the ZC batch path is either submitted to the driver     as part of a valid packet or returned to userspace without violating CQ completion ordering.
    (CVE-2026-74558)

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

ID	Name	Product	Family	Published	Updated	Severity
335767	Linux Distros Unpatched Vulnerability : CVE-2026-74558	Nessus	Misc.	8/15/2026	11/7/2026	medium
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

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