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

  - netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent ctnetlink_alloc_expect() allocates     expectations from a non-zeroing slab cache via nf_ct_expect_alloc(). When CTA_EXPECT_NAT is not present in     the netlink message, saved_addr and saved_proto are never initialized. Stale data from a previous slab     occupant can then be dumped to userspace by ctnetlink_exp_dump_expect(), which checks these fields to     decide whether to emit CTA_EXPECT_NAT. The safe sibling nf_ct_expect_init(), used by the packet path,     explicitly zeroes these fields. Zero saved_addr, saved_proto and dir in the else branch, guarded by     IS_ENABLED(CONFIG_NF_NAT) since these fields only exist when NAT is enabled. Confirmed by priming the     expect slab with NAT-bearing expectations, freeing them, creating a new expectation without     CTA_EXPECT_NAT, and observing that the ctnetlink dump emits a spurious CTA_EXPECT_NAT containing stale     data from the prior allocation. (CVE-2026-43026)

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

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Linux Distros Unpatched Vulnerability : CVE-2026-43026

medium Nessus Plugin ID 311656

Version 1.2

Version 1.1

Version 1.2 May 3, 2026, 4:59 AM CVSS metrics ("CVSSv3 score" set to 5.5) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H") CVSSv3 severity (based on None, severity decreased from "High" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202605030459
Version 1.1 May 2, 2026, 11:12 PM New Plugin Feed: 202605022312