UBUNTU-CVE-2019-15847

    Dashboard / Vulnerabilities / UBUNTU-CVE-2019-15847

    UBUNTU-CVE-2019-15847

    Published: 2 Sept 2019Last Modified: 20 May 2026
    Upstream:
    CVE-2019-15847

    Summary:

    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.

    References: https://ubuntu.com/security/CVE-2019-15847, https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=e99bfdd2a8db732ea84cf0a6486707e5e821ad7e, https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=457dac402027dd7e14543fbd59a75858422cf6c6, https://www.cve.org/CVERecord?id=CVE-2019-15847

    Affected packages

    Package

    Name: gcc-snapshot

    Purl: pkg:deb/ubuntu/gcc-snapshot?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    20151011-0ubuntu1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High