Description
Race condition in Oracle MySQL before 5.5.52, 5.6.x before 5.6.33, 5.7.x before 5.7.15, and 8.x before 8.0.1; MariaDB before 5.5.52, 10.0.x before 10.0.28, and 10.1.x before 10.1.18; Percona Server before 5.5.51-38.2, 5.6.x before 5.6.32-78-1, and 5.7.x before 5.7.14-8; and Percona XtraDB Cluster before 5.5.41-37.0, 5.6.x before 5.6.32-25.17, and 5.7.x before 5.7.14-26.17 allows local users with certain permissions to gain privileges by leveraging use of my_copystat by REPAIR TABLE to repair a MyISAM table.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | mariadb-10.0 | 10.0.28-0+deb8u1 | DSA-3711-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mariadb-10.0 | 10.0.28-0ubuntu0.16.04.1 | — |
| Ubuntu 16.04 LTS | percona-server-5.6 | No fix yet | — |
| Ubuntu 16.04 LTS | percona-xtradb-cluster-5.6 | 5.6.34-26.19-0ubuntu0.16.04.1 | — |
| Ubuntu 14.04 LTS | mariadb-5.5 | 5.5.52-1ubuntu0.14.04.1 | — |
| Ubuntu 14.04 LTS | mysql-5.5 | 5.5.52-0ubuntu0.14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | mariadb +7 | 1:5.5.52-1.el7 | RHSA-2016:2595 |
| RHEL 6 | mysql +7 | 5.1.73-8.el6_8 | RHSA-2017:0184 |
| RHEL 2 | mariadb55-mariadb +5 | 5.5.53-1.el6 | RHSA-2016:2131 |
| RHEL 2 | mysql55-mysql +5 | 5.5.52-1.el6 | RHSA-2016:2130 |
| RHEL 2 | rh-mariadb100-mariadb +8 | 1:10.0.28-5.el6 | RHSA-2016:2927 |
| RHEL 2 | rh-mariadb101-mariadb +9 | 1:10.1.19-6.el6 | RHSA-2016:2928 |
| RHEL 2 | rh-mysql56-mysql +7 | 5.6.34-2.el6 | RHSA-2016:2749 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | mariadb104 | 10.4.30-150100.3.5.10 | SUSE-RU-2023:3956-1 |
| SLES 15 SP1 | python-mysqlclient | 1.4.6-150100.3.3.7 | SUSE-RU-2023:3956-1 |
| SLES 12 SP5 | lz4 | 1.8.0-3.5.2 | SUSE-RU-2023:4991-1 |
| SLES 12 SP5 | mariadb-connector-c | 3.1.22-2.35.1 | SUSE-RU-2023:4991-1 |
| SLES 12 SP5 | mariadb104 | 10.4.30-8.5.46 | SUSE-RU-2023:4991-1 |
| SLES 12 SP5 | python-mysqlclient | 1.3.14-8.9.2 | SUSE-RU-2023:4991-1 |
| SLES 12 SP2 | mariadb | 10.0.28-17.2 | SUSE-SU-2016:2933-1 |
| SLES 12 SP1 | mariadb | 10.0.28-17.2 | SUSE-SU-2016:2933-1 |
| SLES 12 | mariadb | 10.0.28-20.16.2 | SUSE-SU-2016:2932-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | mariadb104 | 10.4.30-150100.3.5.10 | SUSE-RU-2023:3956-1 |
| SLES for SAP 15 SP1 | python-mysqlclient | 1.4.6-150100.3.3.7 | SUSE-RU-2023:3956-1 |
| SLES for SAP 12 SP5 | lz4 | 1.8.0-3.5.2 | SUSE-RU-2023:4991-1 |
| SLES for SAP 12 SP5 | mariadb-connector-c | 3.1.22-2.35.1 | SUSE-RU-2023:4991-1 |
| SLES for SAP 12 SP5 | mariadb104 | 10.4.30-8.5.46 | SUSE-RU-2023:4991-1 |
| SLES for SAP 12 SP5 | python-mysqlclient | 1.3.14-8.9.2 | SUSE-RU-2023:4991-1 |
| SLES for SAP 12 SP2 | mariadb | 10.0.28-17.2 | SUSE-SU-2016:2933-1 |
| SLES for SAP 12 SP1 | mariadb | 10.0.28-17.2 | SUSE-SU-2016:2933-1 |
| SLES for SAP 12 | mariadb | 10.0.28-20.16.2 | SUSE-SU-2016:2932-1 |
| SLE HPC 15 SP1 | mariadb104 | 10.4.30-150100.3.5.10 | SUSE-RU-2023:3956-1 |
| SLE HPC 15 SP1 | python-mysqlclient | 1.4.6-150100.3.3.7 | SUSE-RU-2023:3956-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | mariadb +7 | 1:5.5.52-1.el7 | ELSA-2016-2595 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- MySQL / MariaDB / PerconaDB 5.5.x/5.6.x/5.7.x - 'mysql' System User Privilege Escalation / Race Condition EDB-40678 · local · Nov 1, 2016
GitHub 1 repository
-
firebroo/CVE-2016-6663 ★ 5 · Nov 2, 2016
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 13
- RHSA-2017:0184 Red Hat Security Advisory: mysql security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2927 Red Hat Security Advisory: rh-mariadb100-mariadb security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2928 Red Hat Security Advisory: rh-mariadb101-mariadb security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2749 Red Hat Security Advisory: rh-mysql56-mysql security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2595 Red Hat Security Advisory: mariadb security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2131 Red Hat Security Advisory: mariadb55-mariadb security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:2130 Red Hat Security Advisory: mysql55-mysql security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-3711-1 mariadb-10.0 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-RU-2023:4991-1 Recommended update for mariadb104 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2933-1 Recommended update for mariadb SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2023:3956-1 Recommended update for mariadb104 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2932-1 Security update for mariadb SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2016-2595 Important: mariadb security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 9, 2016
References
- RHSA-2016:2749 vendor-advisory
- https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.html
- RHSA-2017:0184 vendor-advisory
- 20161101 MySQL / MariaDB / PerconaDB - Privilege Escalation / Race Condition Exploit [CVE-2016-6663 / OCVE-2016-5616] mailing-list
- RHSA-2016:2131 vendor-advisory
- https://github.com/mysql/mysql-server/commit/4e5473862e6852b0f3802b0cd0c6fa10b5253291
- https://mariadb.com/kb/en/mariadb/mariadb-5552-release-notes/
- https://www.percona.com/blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664/
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- 40678 exploit
- RHSA-2016:2130 vendor-advisory
- RHSA-2016:2927 vendor-advisory
- [oss-security] 20161025 Re: CVE-2016-6662 - MySQL Remote Root Code Execution / Privilege Escalation ( 0day ) mailing-list
- https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.html
- 92911 vdb-entry
- 93614 vdb-entry
- RHSA-2016:2595 vendor-advisory
- https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html
- https://mariadb.com/kb/en/mariadb/mariadb-10118-release-notes/
- https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.html
- https://github.com/MariaDB/server/commit/347eeefbfc658c8531878218487d729f4e020805
- RHSA-2016:2928 vendor-advisory
- https://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/
- https://legalhackers.com/advisories/MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit.html