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Fedora 44 : nebula (2026-3dbdc5d71d)

high Nessus Plugin ID 369363

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Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3dbdc5d71d advisory.

 Windows tracks NLMTU per address family and Nebula only ever set it for AF_INET, so the IPv6 MTU on every Windows adapter sat at the adapter default of 65535 regardless of tun.mtu and the stack could hand Nebula packets far larger than configured. An IPv6 enabled overlay with tun.mtu under 1280 now refuses to start, matching the other platforms. (#1871) Android 11+ denies bind() on netlink route sockets inside the app sandbox, so local address discovery failed and an Android node advertised no underlay addresses, leaving peers on the same LAN to reach it only at the address a lighthouse observed. (#1881) Recompute the transport checksum on packets a host sends to its own overlay address. On macOS the kernel leaves the checksum unfinished for hardware offload, which does not survive the trip through userspace, so TCP and UDP to a host's own IPv6 overlay address were dropped as corrupt. (#1862)

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

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

Solution

Update the affected nebula package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-3dbdc5d71d

Plugin Details

Severity: High

ID: 369363

File Name: fedora_2026-3dbdc5d71d.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/21/2026

Updated: 10/21/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.61

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2026-78662

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:44, p-cpe:/a:fedoraproject:fedora:nebula

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/11/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-56855, CVE-2026-78662