What is CVE-2019-15847?

CVE-2019-15847 is a vulnerability in the GNU Compiler Collection (GCC) that allows multiple calls of the __builtin_darn intrinsic to be optimized into a single call, reducing the entropy of the random number generator.

How does CVE-2019-15847 affect GNU GCC?

CVE-2019-15847 affects GNU GCC versions up to 10.1.0.

What is the severity of CVE-2019-15847?

The severity of CVE-2019-15847 is high, with a severity value of 7.5.

How can I fix CVE-2019-15847?

To fix CVE-2019-15847, users should update their GNU GCC installations to version 10.1.0 or higher.

Where can I find more information about CVE-2019-15847?

More information about CVE-2019-15847 can be found in the links provided: [Link 1](http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html), [Link 2](http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html), [Link 3](http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html).

Vulnerability/
CVE-2019-15847

high

7.5

CWE

331

2/9/2019

5/8/2024

CVE-2019-15847

First published: Mon Sep 02 2019(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
GNU GCC	<7.5.0
GNU GCC	>=8.0<8.4.0
GNU GCC	>=9.0<9.3.0
GNU GCC	>=10.0<10.1.0
openSUSE Leap	=15.0
openSUSE Leap	=15.1

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Frequently Asked Questions

What is CVE-2019-15847?
CVE-2019-15847 is a vulnerability in the GNU Compiler Collection (GCC) that allows multiple calls of the __builtin_darn intrinsic to be optimized into a single call, reducing the entropy of the random number generator.
How does CVE-2019-15847 affect GNU GCC?
CVE-2019-15847 affects GNU GCC versions up to 10.1.0.
What is the severity of CVE-2019-15847?
The severity of CVE-2019-15847 is high, with a severity value of 7.5.
How can I fix CVE-2019-15847?
To fix CVE-2019-15847, users should update their GNU GCC installations to version 10.1.0 or higher.
Where can I find more information about CVE-2019-15847?
More information about CVE-2019-15847 can be found in the links provided: [Link 1](http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html), [Link 2](http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html), [Link 3](http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html).

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vendor/gnu
canonical/gnu gcc
version/gnu gcc/8.0
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vendor/opensuse
canonical/opensuse leap
version/opensuse leap/15.0
version/opensuse leap/15.1

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