CVE-2019-15847

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.

• CWE-331

• 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

Published

Sep 2, 2019

Last Modified

Jun 17, 2026

Status

Modified

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