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.
- Score
- CVSS 3.1 7.5 High
- Status
- Modified - cve@mitre.org
- Published
- 2019-09-02
- Last modified
- 2026-10-14
- Weaknesses
- CWE-331
Affected products
- Gcc (Gnu)
- Leap (Opensuse)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
