Description
An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.
References (5)
Core 5
Core References
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:0053
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3873-1/
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2018:3500
Exploit, Patch, Third Party Advisory x_refsource_misc
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:0081
Scores
CVSS v3
7.5
EPSS
0.0077
EPSS Percentile
73.6%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-617
Status
published
Products (5)
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
openvswitch/openvswitch
2.7.0 - 2.7.6
redhat/openstack
10
redhat/openstack
13
Published
Sep 19, 2018
Tracked Since
Feb 18, 2026