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

  - netfilter: nft_ct: bail out on template ct in get eval I noticed this issue while looking at a historic     syzbot report [1]. A rule like the one below is enough to trigger the bug: table ip t { chain pre { type     filter hook prerouting priority raw; ct zone set 1 ct original saddr 1.2.3.4 accept } } The first     expression attaches a per-cpu template ct via nft_ct_set_zone_eval() (nf_ct_tmpl_alloc -> kzalloc, tuple     is all zero, nf_ct_l3num(ct) == 0). The next expression then calls nft_ct_get_eval() on the same skb,     treats the template as a real ct and hits the 16-byte memcpy path. With dreg at NFT_REG32_15 this     overflows past struct nft_regs on the kernel stack; with smaller dreg values it silently clobbers adjacent     registers. Reject template ct at the eval entry and in nft_ct_get_fast_eval(), mirroring the check     nft_ct_set_eval() already has. Additionally, bound the address copy in NFT_CT_SRC / NFT_CT_DST by     priv->len instead of by nf_ct_l3num(ct): nf_ct_get_tuple() zeroes the tuple before pkt_to_tuple() fills in     only the protocol-relevant leading bytes, so the trailing bytes of tuple->{src,dst}.u3.all are well-     defined zero. priv->len is validated at rule load, so the copy size is now bounded by the destination     register rather than by an untrusted field on the conntrack. [1]:
    https://syzkaller.appspot.com/bug?id=389cf09cb72926114fce90dc85a2c3231dcb647c (CVE-2026-53267)

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

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Linux Distros Unpatched Vulnerability : CVE-2026-53267

high Nessus Plugin ID 323422

Version 1.5

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.5 Jul 15, 2026, 7:54 AM Detection (updated detection logic) Plugin Feed: 202607150754
Version 1.4 Jul 7, 2026, 11:10 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202607071110
Version 1.3 Jul 2, 2026, 3:38 PM Detection (updated detection logic) Plugin Feed: 202607021538
Version 1.2 Jun 29, 2026, 10:30 AM CVSS metrics ("CVSSv3 score" set to 7.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H") CVSSv3 severity (based on None, severity increased from "Medium" to "High") Plugin Feed: 202606291030
Version 1.1 Jun 28, 2026, 2:21 PM New Plugin Feed: 202606281421