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.
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Wed, 14 Oct 2026 07:30:00 +0000
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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
No data.
Status : Modified
Published: 2019-09-02T23:15:10.837
Modified: 2026-10-14T07:16:46.907
Link: CVE-2019-15847