PYSEC-2026-686

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PYSEC-2026-686

Summary: OpenStack Neutron Race Condition vulnerability

Details: A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

References: https://nvd.nist.gov/vuln/detail/CVE-2017-7543, https://access.redhat.com/errata/RHSA-2017:2447, https://access.redhat.com/errata/RHSA-2017:2448, https://access.redhat.com/errata/RHSA-2017:2449, https://access.redhat.com/errata/RHSA-2017:2450, https://access.redhat.com/errata/RHSA-2017:2451, https://access.redhat.com/errata/RHSA-2017:2452, https://access.redhat.com/security/cve/CVE-2017-7543, https://bugzilla.redhat.com/show_bug.cgi?id=1473792, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543, https://opendev.org/openstack/neutron, https://web.archive.org/web/20200227153412/https://www.securityfocus.com/bid/100237, https://pypi.org/project/neutron, https://github.com/advisories/GHSA-hvxr-2fvv-c3wq