CVE-2019-18282Network attack vector

Device tracking via predictable IPv6 UDP flow labels

Published Jan 16, 2020 · Updated Aug 5, 2024

Information disclosure in Linux kernel 4.3 through 5.x before 5.3.10 allows remote attackers to track devices via IPv6 UDP traffic. The flow dissector's automatic flow-label path applies jhash to receiver-known fields with a boot-static 32-bit hashrnd secret, allowing inference from emitted labels. A receiver observing UDP IPv6 packets can correlate the stable derived value to identify a device or user; no data modification or service interruption is reported.

CVSS severity5.3
Medium
EPSS probability2.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux kernel 4.3 through 5.x before 5.3.10 allows remote attackers to track devices via IPv6 UDP traffic. The flow dissector's automatic flow-label path applies jhash to receiver-known fields with a boot-static 32-bit hashrnd secret, allowing inference from emitted labels. A receiver observing UDP IPv6 packets can correlate the stable derived value to identify a device or user; no data modification or service interruption is reported.

The record

CVE
CVE-2019-18282
Published
Jan 16, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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