Description
The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote attackers to cause a denial of service (delays of legitimate traffic) via crafted packet data that requires excessive evaluation time within the packet classification algorithm for the MegaFlow cache, aka a Tuple Space Explosion (TSE) attack.
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 | No fix yet | — |
| Debian 13 | openvswitch | No fix yet | — |
| Debian 12 | openvswitch | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | openvswitch | No fix yet | — |
| Ubuntu 26.04 LTS | openvswitch | No fix yet | — |
| Ubuntu 25.10 | openvswitch | No fix yet | — |
| Ubuntu 24.04 LTS | openvswitch | No fix yet | — |
| Ubuntu 22.04 LTS | openvswitch | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | openvswitch | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openvswitch | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openvswitch | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | openvswitch | 2.17.5-1 | — |