http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2876
The description says that all 2.6 kernels before 2.6.20.13 and 2.6.21.x before 2.6.21.4 are affected by a remote DoS vulnerability in the netfilter code.
Is Astaro v6 (kernel 2.6.10-58) or v7 (kernel 2.6.16.43-46) affected?
Edit: This specifically affects the ip_conntrack_proto_sctp.c and nf_conntrack_proto_sctp.c which I don't believe Astaro uses, so I don't think Astaro is vulnerable.
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