CVE-2026-80610
Received Received - Intake

Divide-by-Zero in Linux Kernel ENETC Driver

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: enetc: fix potential divide-by-zero when num_vsi is zero For i.MX94 series, all the standalone ENETCs do not support SR-IOV, so pf->caps.num_vsi is zero. This leads to a divide-by-zero in enetc4_default_rings_allocation() when distributing rings among PF and VFs. Division by zero is undefined behavior in C. On ARM64, the UDIV/SDIV instructions silently return zero rather than raising an exception, so the issue does not cause a visible crash. However, relying on this behavior is incorrect and poses a cross-platform compatibility risk. Add an explicit check for num_vsi == 0 and return early after the PF's rings have been configured.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-80610
EUVD
EUVD-2026-67486

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a divide-by-zero issue in the Linux kernel's enetc driver, specifically affecting i.MX94 series devices. It occurs when num_vsi is zero, which is the case for standalone ENETCs that do not support SR-IOV. The function enetc4_default_rings_allocation() attempts to divide by num_vsi, leading to undefined behavior. While ARM64 silently returns zero, this is incorrect and poses cross-platform risks.

Detection Guidance

This vulnerability can be detected by checking if the Linux kernel version is affected and if the system uses ENETC with SR-IOV disabled. Inspect the kernel log for divide-by-zero errors or check the num_vsi value in the ENETC driver. Commands like 'dmesg | grep -i divide' or 'cat /proc/net/enetc' may help identify issues.

Impact Analysis

The vulnerability could cause undefined behavior in the Linux kernel's network driver, potentially leading to system instability or unexpected behavior. However, on ARM64, it may not crash but could still cause incorrect ring allocations, affecting network performance or functionality.

Mitigation Strategies

Apply the kernel patch that adds an explicit check for num_vsi == 0 in enetc4_default_rings_allocation(). Update the Linux kernel to a version containing the fix. For i.MX94 series, ensure SR-IOV is not enabled on standalone ENETC devices.

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