External risk intelligence

Linux Kernel nvmet-tcp Bounds Check Bypass Leads to Out-of-Bounds Access

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2022-50717

This vulnerability exists in the NVMe over TCP (nvmet-tcp) implementation within the Linux kernel. NVMe-over-Fabrics is typically used within internal storage area networks (SANs) or data center fabrics. While network-reachable, these services are not intended for public internet exposure and are almost always restricted to trusted internal networks.

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in the Linux kernel's nvmet-tcp component, which handles data transfer over networks. This issue could allow unauthorized access and manipulation of data if exploited. The primary concern is to confirm if this specific technology is in use within the organization and if it is exposed in a way that could be targeted.

Out-of-bounds access in data transfer.
Confirms use and exposure of this technology.
Assess relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could reach this vulnerability over the network without any prior authentication or user interaction. The vulnerability lies within the `nvmet-tcp` component of the Linux kernel. By sending specially crafted network data, an attacker could trigger an out-of-bounds access, potentially leading to significant data corruption or system compromise.

Network exposure required.
Specially crafted data triggers vulnerability.
High risk of data corruption or compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in the Linux kernel's nvmet-tcp implementation could allow an attacker to cause an out-of-bounds access when handling data. This may affect system stability and integrity under specific network conditions.

System stability and integrity.
Out-of-bounds memory access.
Potential denial of service.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the Linux kernel's nvmet-tcp component impacts storage infrastructure. Infrastructure or platform teams are likely responsible for managing the kernel and its associated services. The initial step should be to identify all systems running the affected kernel version, determine their network accessibility, and assess their criticality to operations. This information will guide the prioritization of remediation efforts and the coordination with relevant teams.

Own by infrastructure or platform teams.
Verify network exposure and criticality.
Plan remediation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the nvmet-tcp component in the Linux kernel?

The nvmet-tcp component facilitates NVMe-over-Fabrics, a technology that allows storage devices to communicate over standard network protocols. It is primarily used by enterprise data centers to link servers with high-speed storage area networks, enabling efficient data access across distributed infrastructure.

What does an out-of-bounds access mean for CVE-2022-50717?

This vulnerability involves an improper bounds check, which is a flaw where software fails to verify that an index is within a permitted memory range. In CVE-2022-50717, the system fails to validate a 'Transfer Tag' used as an index, allowing an attacker to read or write to unauthorized memory locations, which can lead to system crashes or data manipulation.

How is this vulnerability triggered by an attacker?

An attacker triggers this bug by sending specially crafted network packets to a system running the affected nvmet-tcp service. The vulnerability is not triggered by standard, legitimate storage traffic; it requires specifically manipulated data designed to exploit the missing bounds check during the handling of data transfer units.

Do I need to worry if my storage is on an internal network?

According to Halo Surface Signal, this service is typically restricted to trusted internal data center fabrics and is not designed for public internet exposure. While the vulnerability is technically network-reachable, its practical relevance is significantly lower if your infrastructure is properly segmented and isolated from external access.

When should I prioritize a response for this kernel issue?

Prioritize your response by first identifying all systems running the affected Linux kernel version. Focus efforts on systems where the storage fabric is accessible across network boundaries, then coordinate with your infrastructure team to plan kernel updates or apply relevant patches to remediate the underlying logic error.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.