CVE-2019-15847

What it is

The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

3.2% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2019-09-02 23:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-14 07:16 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.2% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-09-02 23:15 UTC

Last modified

2026-10-14 07:16 UTC

Exploit probability

3.2% · EPSS, next 30 days

Weakness

CWE-331

Record status

Modified

Affected

• Gnu Gcc < 7.5.0
• Gnu Gcc < 8.4.0
• Gnu Gcc < 9.3.0
• Gnu Gcc < 10.1.0
• Opensuse Leap 15.0
• Opensuse Leap 15.1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

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-2019-15847.md and follow it. Check whether this project is affected by CVE-2019-15847. 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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