Anthropic's Research Claude Model Generates Exploit Bypassing Linux Protections for Root RCE via MPTCP and CVE-2026-98432
Anthropic researchers demonstrated that an internal, unreleased version of the Claude model can autonomously develop working exploit code capable of achieving remote root command execution on Linux systems.
The model was given an initial task and subsequently produced an exploit targeting CVE-2026-98432, a use-after-free flaw in the kernel networking stack that manifests when handling parallel TCP connections over MPTCP.
The attack proceeds in two distinct stages. First, the generated code bypasses KASLR to discover the randomized kernel base address, a process that took 48 minutes in the reported demonstration. Once the address is obtained, the second stage hijacks control flow and spawns a root shell within approximately five additional minutes.
No user interaction or credentials are required when the target system uses the specific MPTCP configuration described in the report.
Anthropic emphasized that the experiment relied on a non-public research model and that ordinary users should not expect the same results from currently available chat interfaces.
Risk assessments differ between vendors: the Linux kernel team assigned the vulnerability a CVSS score of 9.8, while Red Hat rated it 5.9, highlighting the practical difficulties of exploitation. A fix has already been committed to the mainline kernel and supported stable branches, although administrators are advised to confirm availability through their specific distribution provider.
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