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Ubuntu FastNetMon Critical DDoS Denial of Service Fix USN-8429-1

ubuntu
Calendar Grey June 15, 2026
Dist Ubuntu Esm H88
Security issues in FastNetMon fixed for Ubuntu versions; critical updates available for DDoS detector.
Several security issues were fixed in FastNetMon.

Summary

Several security issues were fixed in FastNetMon.

Software Description:

- fastnetmon: High-performance DDoS detector

Details:

It was discovered that FastNetMon incorrectly validated prefix lengths when

decoding BGP NLRI data. A remote attacker could possibly use this issue to

cause a denial of service or execute arbitrary code. This issue only

affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-48686)

It was discovered that FastNetMon incorrectly sanitized input in the

Juniper router integration plugin. An attacker could possibly use this

issue to execute arbitrary commands. (CVE-2026-48687)

It was discovered that FastNetMon incorrectly handled buffer bounds checks

when processing network traffic. A remote attacker could possibly use this

issue to cause a denial of service or execute arbitrary code. This issue

only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-48689)

It was discovered that FastNetMon incorrectly handled encoding the BGP

AS_PATH attribute. A ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical command execution Ubuntu fastnetmon

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  fastnetmon                      1.2.8+git20250911-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 24.04 LTS
  fastnetmon                      1.2.6-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  fastnetmon                      1.1.4-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

After a standard system update you need to restart fastnetmon to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8429-1

CVE-2026-48686, CVE-2026-48687, CVE-2026-48689, CVE-2026-48691,

CVE-2026-48694

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8429-1

Topics%20covered

Topics Covered

security advisory denial of service critical command execution Ubuntu fastnetmon

Package Information

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