CVE-2026-80610 net: enetc: fix potential divide-by-zero when num_vsi is zero
A divide-by-zero error in the Linux kernel ENETC driver can cause undefined behavior or potential crashes on non-ARM64 platforms when SR-IOV is unsupported.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80610?
CVE-2026-80610 is a denial of service vulnerability in Linux, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-80610?
How do I fix CVE-2026-80610?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80610 being exploited?
There is no known exploitation of CVE-2026-80610 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-80610, GHSA-497p-j4gh-26mw, UBUNTU-CVE-2026-80610.