Device tracking vulnerability via UDP in Linux kernel

Published: 2020-01-16 | Updated: 2021-03-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-18282
Exploitation vector Network
Public exploit N/A
Vulnerable software
Linux kernel
Operating systems & Components / Operating system


Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU51269

Risk: Medium


CVE-ID: CVE-2019-18282

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No


The vulnerability allows a remote attacker to track devices via UDP packets.

The vulnerability exists due to excessive data output in the flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 and affects net/core/flow_dissector.c and related code. The auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. A remote attacker can use the hashrnd value and track reliably track activity of devices using UDP packets.


Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.3.10

External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?