CVE-2019-10638

What it is

In the Linux kernel before 5.1.7, a device can be tracked by an attacker using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). An attack may be conducted by hosting a crafted web page that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP addresses.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure.

Exploit odds

2.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-07-05 23:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:11 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.6% in the next 30 days (EPSS).
• Severity: 6.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-07-05 23:15 UTC

Last modified

2026-06-17 02:11 UTC

Exploit probability

2.6% · EPSS, next 30 days

Weakness

CWE-326 · Inadequate encryption strength

Record status

Modified

Affected

• Linux Kernel < 5.1.7

Attack profile CVSS 3.0 · 6.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-10638.md and follow it. Check whether this project is affected by CVE-2019-10638. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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