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CVE-2019-15847

HIGH
7.5
CVSS Score
Published: September 2, 2019 at 10:03 PM UTC
Updated: October 14, 2026 at 07:16 AM UTC
2 products affected across 2 vendorsLeapGCC

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Severity
HIGH7.5
Exploit prediction
EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GCC· Gnu
95%
All versionsv < 7.5.010.0 ≤ v < 10.1.08.0 ≤ v < 8.4.09.0 ≤ v < 9.3.0
Affected range stops below 10.1.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.4.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.0, so it looks safe — our inference, not a vendor statement
Leap· openSUSEdrupal
95%
15.015.1

References (5)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-331

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