Anza, a software developer focused on Solana, warned mainnet-beta validators on Nov. 1 to take immediate protective action against CVE-2026-98432. The Linux vulnerability could let attackers remotely seize control of affected servers. The flaw has a critical severity rating of 9.8 out of 10.
Solana Foundation validator relations lead Tim Garcia said the Linux kernel already contained a fix, but Ubuntu remained unpatched. Ubuntu is widely used by Solana validators. Garcia advised affected operators to reject incoming TCP packets that include IPv4 options until a security update becomes available. Garcia also recommended disabling Multipath TCP (MPTCP) and TCP request-socket migration during that period.
The vulnerability arises from incorrect memory handling while processing IPv4 TCP connections. Attackers can exploit a race condition without authenticating or requiring user interaction. Anthropic disclosed research on Oct. 27 showing that an unreleased Claude research model had developed an exploit for Linux servers with an MPTCP listener. Anthropic said the exploit could run commands with root privileges.
The attack first extracted information from kernel memory and then induced the system to run malicious commands. Anthropic said the demonstration reached remote command execution in approximately 53 minutes. That level of access could let attackers control an affected server and compromise validator operations or sensitive credentials held there.
However, the demonstrated exploit required a particular MPTCP configuration. No evidence shows that attackers have compromised Solana validators through this vulnerability. The research also does not establish that the demonstrated attack can affect every validator.
As of Nov. 2, Ubuntu's security tracker classified the main Linux kernel package for Ubuntu 24.04 as vulnerable, with remediation still under development. The tracker identified 6.8.0-149.149 as the version planned to resolve the issue. Affected operators therefore remain reliant on temporary protections. Red Hat warned that filtering malicious IPv4 traffic cannot remove all exposure and could disrupt some workloads.
Amazon Web Services confirmed the availability of fixed kernel packages for Amazon Linux 2 and Amazon Linux 2023. Amazon Web Services instructed operators to install the updates and reboot servers. Anza requires validators to use Ubuntu 24.04 and have public IPv4 connectivity. Each server's kernel version and network configuration determine actual exposure.
The number of Solana validators using affected configurations remains unknown. Ubuntu operators still need to install the corrected kernel when available and verify after rebooting that servers are running the corrected version.
Solana Validators Urged to Act on Critical Linux Vulnerability CVE-2026-98432
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Summary
Vulnerability news emerged as Anza urged Solana validators to address the critical Linux flaw CVE-2026-98432, rated 9.8/10. The issue impacts Ubuntu, widely used on Solana’s mainnet-beta. Solana’s Tim Garcia recommended disabling MPTCP and rejecting IPv4. On-chain news shows no breaches yet, but Anthropic found root access possible in 53 minutes. A fix is expected in kernel 6.8.0-149.149. AWS has released patched kernels for Amazon Linux 2 and 2023.
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