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

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Summary

CVECVE-2026-80610
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:44 UTC
Updated2026-08-28 08:16:44 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.049970000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 cd37bcb67f909a8683cc8c38a63ac7367a7f6161 git Not specified
CNA Linux Linux affected 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 5da65537792b68b6052ffcab65e04c27aea6dfe4 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cd37bcb67f909a8683cc8c38a63ac7367a7f6161 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5da65537792b68b6052ffcab65e04c27aea6dfe4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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