CVE-2019-10638 Information disclosure in n/a

What is CVE-2019-10638?

CVE-2019-10638 is a medium-severity vulnerability in Linux kernel, published on 5 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-326

Which versions are affected by CVE-2019-10638?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2019-10638?

Upgrade to a fixed version.

Is CVE-2019-10638 being exploited?

There is no known exploitation of CVE-2019-10638 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-41613, DEBIAN-CVE-2019-10638, GHSA-wr6f-49rm-hx88, UBUNTU-CVE-2019-10638.