Linux Kernel enetc enetc4_default_rings_allocation num_vsi divide by zero

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel. Affected by this issue is the function enetc4_default_rings_allocation of the component enetc. The manipulation of the argument num_vsi leads to divide by zero. This vulnerability is documented as CVE-2026-80610. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel (affected version unknown). This issue affects the function enetc4_default_rings_allocation of the component enetc. The manipulation of the argument num_vsi with an unknown input leads to a divide by zero vulnerability. Using CWE to declare the problem leads to CWE-369. The product divides a value by zero. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-80610 since 08/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/28/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Applying the patch cd37bcb67f909a8683cc8c38a63ac7367a7f6161/5da65537792b68b6052ffcab65e04c27aea6dfe4 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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