The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8529-1 advisory.

    It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when     handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43503)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - InfiniBand drivers;

    - SCSI subsystem;

    - Thermal drivers;

    - USB over IP driver;

    - Network file system (NFS) server daemon;

    - SMB network file system;

    - Tracing infrastructure;

    - B.A.T.M.A.N. meshing protocol;

    - Ethernet bridge;

    - Ceph Core library;

    - DCCP (Datagram Congestion Control Protocol);

    - IPv4 networking;

    - IPv6 networking;

    - Netfilter;

    - RxRPC session sockets;

    - X.25 network layer; (CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455, CVE-2026-31402,     CVE-2026-31607, CVE-2026-31637, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011,     CVE-2026-43037, CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-45988,     CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-8529-1)

medium Nessus Plugin ID 326482

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Jul 30, 2026, 11:45 AM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:H/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:H/RL:O/RC:C") Exploit attributes ("Exploited by malware" set to "True") Plugin Feed: 202607301145
Version 1.2 Jul 14, 2026, 8:07 AM Exploit attributes ("Exploit framework core" set to "True") Plugin Feed: 202607140807
Version 1.1 Jul 13, 2026, 6:34 PM New Plugin Feed: 202607131834