Description
An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the type and command earlier, when it might still be invalid. This causes an assertion failure (via OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default.
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 14 | openvswitch | 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 | — |
| Debian 13 | openvswitch | 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 | — |
| Debian 12 | openvswitch | 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 | — |
| Debian 9 | openvswitch | 2.6.10-0+deb9u1 | DLA-2571-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | openvswitch | 2.9.2-0ubuntu0.18.04.3 | USN-3873-1 |
| Ubuntu 16.04 LTS | openvswitch | 2.5.5-0ubuntu0.16.04.2 | USN-3873-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openvswitch +7 | 2.9.0-70.el7fdp.1 | RHSA-2018:3500 |
| RHEL 7 | redhat-release-virtualization-host +1 | 4.2-7.5.el7 | RHBA-2018:3683 |
| RHEL 7 | redhat-virtualization-host +1 | 4.2-20181121.0.el7_6 | RHBA-2018:3683 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 13 | openvswitch +6 | 2.9.0-83.el7fdp.1 | RHSA-2019:0081 |
| Red Hat OpenStack 10 | openvswitch +7 | 2.9.0-83.el7fdp.1 | RHSA-2019:0053 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | openvswitch | 2.7.6-3.23.1 | SUSE-SU-2018:4128-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | openvswitch | 2.7.6-3.23.1 | SUSE-SU-2018:4128-1 |
Advisories 7
- RHSA-2019:0081 Red Hat Security Advisory: openvswitch security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0053 Red Hat Security Advisory: openvswitch security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2018:3500 Red Hat Security Advisory: openvswitch security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHBA-2018:3683 Red Hat Bug Fix Advisory: Important: redhat-virtualization-host bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DLA-2571-1 openvswitch - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3873-1 openvswitch vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:4128-1 Security update for openvswitch SUSE / openSUSE Security Updates · Feb 4, 2026
References
- RHSA-2019:0053 vendor-advisory
- USN-3873-1 vendor-advisory
- RHSA-2018:3500 vendor-advisory
- https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde
- RHSA-2019:0081 vendor-advisory
- [debian-lts-announce] 20210219 [SECURITY] [DLA 2571-1] openvswitch security update mailing-list