CVE-2011-2534: Buffer overflow in the clusterip_proc_write function in net/ipv4/netfilter/ipt_CLUSTERIP.c in the Linux ker...

Security readout for executives and security teams

CVE-2011-2534 is an old Linux kernel flaw in the netfilter CLUSTERIP code. A local user could trigger a buffer overflow through a crafted write operation, potentially crashing the system or causing unspecified other effects. The source bundle does not show active exploitation or a CVSS score. Exposure is most likely on legacy Linux systems running kernels before 2.6.39 or vendor kernels without the relevant backport. Risk requires local user capability according to the CVE description, so internet-facing exposure is not supported by the provided sources. Treat this as a legacy Linux hygiene issue unless affected systems still host untrusted local users. Prioritize remediation where old kernels support shared services, multi-user environments, or business-critical workloads. No active exploitation evidence is provided. Mitigation focus: Upgrade affected Linux kernels to 2.6.39 or a vendor-patched equivalent.; Check distribution advisories for backported fixes to ipt_CLUSTERIP.; Reduce unnecessary local shell access on legacy Linux hosts..

Prepared

Jun 28, 2026, 00:52 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.