Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-15847

CVE-2019-15847HIGH

n/a n/a — The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into …

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  N  N    7.5   .0318   87.9     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Sep 2   Reserved by mitre
  Sep 2   Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2019-15847. Received CVSS 7.5 and CPE data from NVD.

CWE-331 · CNA: mitre · CVSS v3.1 · 5 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 2, 2019	Reserved	Reserved by mitre
September 2, 2019	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2019-15847. Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-331

References (5)

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html [Mailing List, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481 [Issue Tracking, Vendor Advisory]

Authoritative record: CVE-2019-15847 at cve.org

Weaknesses: CWE-331

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-15847 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.