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Critical Linux Vulnerability CVE-2026-98432 Threatens Solana Validators

Critical Linux Vulnerability CVE-2026-98432 Threatens Solana Validators

First seen 2 Nov 2026, 14:15 UTC • •
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ThreatCluster AI
ThreatCluster •November 2, 2026 at 19:47 UTC
  • •CVE-2026-98432 is a critical Linux vulnerability with a CVSS score of 9.8.
  • •Solana validators using Ubuntu are specifically advised to implement temporary traffic filtering.
  • •Proof-of-concept exploits have been developed, demonstrating potential for remote command execution.

A critical Linux kernel vulnerability, CVE-2026-98432, has been identified, affecting Solana mainnet-beta validators running on Ubuntu. The flaw, rated 9.8 on the CVSS scale, allows remote command execution through a race condition in the IPv4 network subsystem. Tim Garcia from the Solana Foundation has advised operators to restrict inbound TCP traffic and disable certain TCP features until a patch is released. As of November 2, Ubuntu has not yet provided a fix, although patches exist for other distributions. The vulnerability could compromise validator operations and sensitive credentials. Anthropic researchers demonstrated a proof-of-concept exploit that could allow attackers to gain root access without user interaction. The situation is urgent as node operators are at risk until mitigations are implemented.

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Timeline

2026-10-15
CVE-2026-98432 published
A critical vulnerability in the Linux kernel was disclosed, affecting multiple distributions.
Finance.Biggo
2026-10-29
First public PoC demonstrated
Anthropic researchers showed a proof-of-concept exploit for the vulnerability, allowing root access.
Forklog
2026-11-01
Anza issues warning to validators
Anza alerted Solana validators to take immediate action against the critical vulnerability.
Kucoin
2026-11-02
Ubuntu remains unpatched
As of November 2, Ubuntu's security tracker still lists affected kernels as vulnerable with no fix available.
Cryptonews

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Common questions

Which Ubuntu versions are affected?
Ubuntu versions 22.04, 24.04, 26.04, and 26.10 are currently listed as vulnerable.
What immediate actions should validators take?
Validators should restrict inbound TCP packets with IPv4 options and disable Multipath TCP and TCP request socket migration.
Is there a patch available for Ubuntu?
No, as of November 2, Ubuntu has not released a patch for this vulnerability, although fixes are available for other distributions.