The remote Ubuntu 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8426-1 advisory.

    It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic     operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or     possibly escape a container. (CVE-2026-31431)

    It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer     operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in     the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43284, CVE-2026-43500)

    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, CVE-2026-46300)

    Qualys discovered that a race condition existed in the ptrace subsystem of the Linux kernel when     privileged processes are exiting. An unprivileged local attacker could use this issue to expose sensitive     information. (CVE-2026-46333)

    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:

    - Cryptographic API;

    - Ethernet bonding driver;

    - SMB network file system;

    - Netfilter;

    - io_uring subsystem;

    - Packet sockets;

    - RDS protocol;

    - TLS protocol; (CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351, CVE-2026-31419,     CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43494,     CVE-2026-46028)

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 20.04 LTS / 22.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8426-1)

high Nessus Plugin ID 320848

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Oct 6, 2026, 7:18 PM Detection (removed incorrect Ubuntu Pro subscription notice on Ubuntu 22.04 hosts running standard kernels) Plugin Feed: 202610061918
Version 1.2 Jun 15, 2026, 6:51 AM Exploit attributes ("Exploit framework core" set to "True") Exploit attributes ("Exploited by malware" set to "True") Exploit attributes ("Exploit framework metasploit" set to "True") Plugin Feed: 202606150651
Version 1.1 Jun 12, 2026, 7:53 PM New Plugin Feed: 202606121953