Description
conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.
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 8 | conntrack | 1:1.4.2-2+deb8u1 | DSA-3341-1 |
| Debian 7 | conntrack | 1:1.2.1-1+deb7u1 | DSA-3341-1 |
| Debian 6.0 | conntrack | 1:0.9.14-2+deb6u1 | DLA-295-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | conntrack-tools | 1.4.2-5.2 | SUSE-SU-2015:1545-1 |
| SLES 12 | libnetfilter_cthelper | 1.0.0-7.1 | SUSE-SU-2015:1545-1 |
| SLES 12 | libnetfilter_cttimeout | 1.0.0-9.1 | SUSE-SU-2015:1545-1 |
| SLES 11 SP4 | conntrack-tools | 1.0.0-0.9.1 | SUSE-SU-2015:1683-1 |
| SLES 11 SP3 | conntrack-tools | 1.0.0-0.9.1 | SUSE-SU-2015:1683-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Cloud Compute Node for SUSE Linux Enterprise 12 | conntrack-tools | 1.4.2-5.2 | SUSE-SU-2015:1545-1 |
| SUSE Cloud Compute Node for SUSE Linux Enterprise 12 | libnetfilter_cthelper | 1.0.0-7.1 | SUSE-SU-2015:1545-1 |
| SUSE Cloud Compute Node for SUSE Linux Enterprise 12 | libnetfilter_cttimeout | 1.0.0-9.1 | SUSE-SU-2015:1545-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | conntrack-tools | 1.4.4-1.3 | openSUSE-SU-2024:10430-1 |
Advisories 5
- DSA-3341-1 conntrack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-295-1 conntrack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:1683-1 Security update for conntrack-tools SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10430-1 conntrack-tools-1.4.4-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1545-1 Security update for conntrack-tools SUSE / openSUSE Security Updates · Feb 4, 2026
References
- FEDORA-2015-5eb2131441 vendor-advisory
- [oss-security] 20150817 Re: CVE request: conntrackd denial of service with unusual network traffic mailing-list
- https://git.netfilter.org/conntrack-tools/commit/?id=c392c159605956c7bd4a264ab4490e2b2704c0cd
- FEDORA-2015-1aee5e6f0b vendor-advisory
- [oss-security] 20150814 CVE request: conntrackd denial of service with unusual network traffic mailing-list
- openSUSE-SU-2015:1688 vendor-advisory
- http://bugzilla.netfilter.org/show_bug.cgi?id=910
- DSA-3341 vendor-advisory