CVE-2019-15847

HighCVSS 7.5/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-331

Affected software

Vendor	Product	Versions
n/a	n/a	n/a
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5

References

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

Timeline

Published: Sep 2, 2019
Last modified: Oct 14, 2026
NVD status: Modified

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