CVE-2026-80610

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 < cd37bcb67f909a8683cc8c38a63ac7367a7f6161affected
LinuxLinux2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 < 5da65537792b68b6052ffcab65e04c27aea6dfe4affected
LinuxLinux6.19affected
LinuxLinux0 < 6.19unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References