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H2O’s response to CVE-2026-31431

May 1, 2026: H2O.ai Initial Assessment

 

The H2O.ai team is continuing to investigate and evaluate the recently disclosed “Copy Fail” Linux kernel flaw, CVE-2026-31431, which may allow local users to gain root access on affected systems.

This vulnerability allows a local, unprivileged user on an affected kernel to escalate privileges to root. It is important to note that this is not a standalone remote exploit. An attacker must first gain code execution on the machine, either directly or through a prior compromise, such as a web application vulnerability.

 

As soon as H2O.ai became aware of this vulnerability, we began evaluating all released software versions and cloud-hosted systems to determine potential impact.

 

Temporary Workaround

Our recommendation is to blacklist kernel module algif_aead. The blacklisting is safe for all H2O workloads.

The node-level algif_aead blacklist eliminates the exploit path entirely regardless, so application-level restrictions are belt-and-suspenders.

 

echo "install algif_aead /bin/false" > /etc/modprobe.d/disable-algif.conf

rmmod algif_aead 2>/dev/null || true



Current Remediation Strategies

For our Managed Cloud Customers

We are closely coordinating with AWS to ensure our underlying infrastructure is patched and secure. As an added layer of defense, our systems utilize real-time threat detection to identify and block exploit attempts targeting this vulnerability.

 

For our HAIC Customers

We strongly recommend upgrading infrastructure host kernels to a patched kernel version listed below.

As an application-level temporary mitigation (before patching host kernel), customers should limit/disable code execution capabilities where applicable:

 

 

For any additional questions, reach out to H2O.ai support at support@h2o.ai.

 

Additional Details

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