DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1021740

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openvswitch (PTS)buster2.10.7+ds1-0+deb10u1vulnerable
buster (security)2.10.7+ds1-0+deb10u4vulnerable
bullseye (security), bullseye2.15.0+ds1-2+deb11u4vulnerable
sid, trixie3.2.2~git20231029-2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - openvswitch <no-dsa> (Minor issue)
[bullseye] - openvswitch <no-dsa> (Minor issue)
[buster] - openvswitch <no-dsa> (Minor issue)

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