Description
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.
Published: 2019-09-02
Score: 7.5 High
EPSS: 3.2% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
EUVD EUVD EUVD-2019-6763 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.
History

Wed, 14 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
References

Subscriptions

Gnu Gcc
Opensuse Leap
Redhat Enterprise Linux Rhel Software Collections
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-14T06:50:08.351Z

Reserved: 2019-09-02T00:00:00.000Z

Link: CVE-2019-15847

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-09-02T23:15:10.837

Modified: 2026-10-14T07:16:46.907

Link: CVE-2019-15847

cve-icon Redhat

Severity : Moderate

Publid Date: 2019-09-02T00:00:00Z

Links: CVE-2019-15847 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses