7.5

CVE-2019-15847: gnu gcc Insufficient Entropy

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2019-15847RHSA-2020:0924RHSA-2020:1864
Published 02-09-2019Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2019-15847 is a high (CVSS 7.5) Insufficient Entropy vulnerability in gnu gcc. EPSS estimates a 3.18% chance of exploitation in the next 30 days, higher than 87.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
3.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 10
OPENSUSE-SU-2019:2364-1OPENSUSE-SU-2019:2365-1OPENSUSE-SU-2020:0716-1OPENSUSE-SU-2024:10703-1SUSE-SU-2019:2702-1SUSE-SU-2019:3061-1

Timeline

  1. 02-09-2019
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

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 metrics

8 scores · 7 sources · 3 versions

EPSS trend

Probability

3.18%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.18% on 18-09-2026

18-09-202618-10-2026
EPSS score
3.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat83 products
  • cpp< 0:8.3.1-5.el8
  • cpp-debuginfo< 0:8.3.1-5.el8
  • devtoolset-8-gcc< 0:8.3.1-3.2.el6 | < 0:8.3.1-3.2.el7
  • devtoolset-8-gcc-c++< 0:8.3.1-3.2.el6 | < 0:8.3.1-3.2.el7
  • devtoolset-8-gcc-debuginfo< 0:8.3.1-3.2.el6 | < 0:8.3.1-3.2.el7
Ubuntu12 products
  • gcc-10< 10.2.0-5ubuntu1~20.04
  • gcc-6All versions (No fix recorded)
  • gcc-6-crossAll versions (No fix recorded)
  • gcc-6-cross-portsAll versions (No fix recorded)
  • gcc-7< 7.5.0-3ubuntu1~18.04
Alpine1 product
  • gcc≥ 8.0, < 9.3.0-r0
Chainguard1 product
  • gcc-6All versions (No fix recorded)
Debian1 product
  • gcc-9< 9.2.1-7
Gnu1 product
  • gcc< 7.5.0 | ≥ 8.0, < 8.4.0 | ≥ 9.0, < 9.3.0 | ≥ 10.0, < 10.1.0
Opensuse1 product
Wolfi1 product
  • gcc-6All versions (No fix recorded)

8 vendors · 101 products

References

28 links
Show all 28 references