{"cve":"CVE-2019-15847","nvd":{"published":"2019-09-02T23:15:10.837","modified":"2026-10-14T07:16:46.907","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-331"],"references":["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://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481","http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html"],"products":["gnu:gcc","opensuse:leap"],"source":"nvd","synced_at":"2026-10-19T20:58:39.700375520+00:00"},"epss":{"cve":"CVE-2019-15847","score":0.03181,"percentile":0.87974,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}