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

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-09-02T22:03:34.000Z

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