Description
In lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a buffer over-read while parsing malformed TCP, UDP, and IPv6 packets in the functions `extract_l3_ipv6`, `extract_l4_tcp`, and `extract_l4_udp` that can be triggered remotely.
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 | 2.8.1+dfsg1-2 | — |
| Debian 13 | openvswitch | 2.8.1+dfsg1-2 | — |
| Debian 12 | openvswitch | 2.8.1+dfsg1-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openvswitch +8 | 2.7.2-1.git20170719.el7fdp | RHSA-2017:2418 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 11 | openvswitch +6 | 2.6.1-13.git20161206.el7ost | RHSA-2017:2727 |
| Red Hat OpenStack 10 | openvswitch +1 | 2.6.1-13.git20161206.el7ost | RHSA-2017:2648 |
Advisories 3
- RHSA-2017:2727 Red Hat Security Advisory: openvswitch security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:2648 Red Hat Security Advisory: openvswitch security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:2418 Red Hat Security Advisory: openvswitch security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
References
- RHSA-2017:2727 vendor-advisory
- RHSA-2017:2418 vendor-advisory
- https://mail.openvswitch.org/pipermail/ovs-dev/2017-March/329323.html
- RHSA-2017:2648 vendor-advisory