CVE-2019-15847
For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 3.18% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-331
- Affected
- gnu/gcc · opensuse/leap
- Source
- cve@mitre.org
EPSS 3.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.