CVE-2019-15847

HIGH

GCC < 10 - Insufficient Entropy in POWER9 __builtin_darn Intrinsic

Title source: llm

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.

References (4)

Core 4

Core References

Issue Tracking, Vendor Advisory x_refsource_misc

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html

Scores

CVSS v3 7.5

EPSS 0.0321

EPSS Percentile 86.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-331

Status published

Products (3)

gnu/gcc < 7.5.0

opensuse/leap 15.0

opensuse/leap 15.1

Published Sep 02, 2019

Tracked Since Feb 18, 2026