CVE-2019-15847
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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 3.18% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 87.9% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2019-09-02 22:03Z7 YR AGO
- Last updated
- 2026-10-14 06:50Z15 DAYS AGO
- Reserved
- 2019-09-02
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-331Insufficient EntropyBase
- Data version
- 5.2
- Document digest
- 909a7a00ab196daeda09ef9de901900e4fe51f854f473444bc85c04a91985949
05 Affected products
06 References
- gcc.gnu.orghttps://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
- lists.opensuse.orgopenSUSE-SU-2019:2364http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
- lists.opensuse.orgopenSUSE-SU-2019:2365http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
- lists.opensuse.orgopenSUSE-SU-2020:0716http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
07 Fixed in
Debian 11
- gcc-9 Fixed in 9.2.1-7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- gcc-6 No fix yet
- gcc-6-cross No fix yet
- gcc-6-cross-ports No fix yet
- gcc-7 Fixed in 7.5.0-3ubuntu1~18.04
- gcc-7-cross No fix yet
- gcc-7-cross-ports No fix yet
- gcc-8 Fixed in 8.3.0-26ubuntu1~18.04
- gcc-8-cross No fix yet
- gcc-8-cross-ports No fix yet
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- gcc-10 Fixed in 10.2.0-5ubuntu1~20.04
- gcc-8-cross No fix yet
- gcc-8-cross-ports No fix yet
- gcc-9-cross-ports No fix yet
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- gcc-9-cross-ports No fix yet
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- gcc-9-cross-ports No fix yet
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- gcc-snapshot No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.