{"id":"ALPINE-CVE-2019-15847","details":"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.","modified":"2026-09-09T06:17:50.089440224Z","published":"2019-09-02T23:15:10.837Z","upstream":["CVE-2019-15847"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2019-15847"}],"affected":[{"package":{"name":"gcc","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/gcc?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0"},{"fixed":"9.3.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2019-15847.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}