Riskcovery

CVE-2026-80610

net: enetc: fix potential divide-by-zero when num_vsi is zero

State
Published
Severity
Not scored
Published
Aug 28, 2026
Updated
Aug 28, 2026
Reserved
Aug 26, 2026

Read the record on cve.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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 to before cd37bcb67f909a8683cc8c38a63ac7367a7f6161Affected
  • 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 to before 5da65537792b68b6052ffcab65e04c27aea6dfe4Affected
LinuxLinux
  • 6.19Affected
  • before 6.19Not affected
  • 7.1.5 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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