CVE-2026-68333 dpaa2-switch: put MAC endpoint device on disconnect
A reference counting bug in the dpaa2-switch driver causes a device reference leak on disconnect, potentially leading to resource exhaustion and denial of service.
- 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-2026-68333?
CVE-2026-68333 is a denial of service vulnerability in Linux, published on 10 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:
dpaa2-switch: put MAC endpoint device on disconnect
fsl_mc_get_endpoint() returns the MAC endpoint device with a reference taken through device_find_child(). The switch port connect path stores that device in mac->mc_dev and keeps it for the lifetime of the connected MAC object.
However, the disconnect path only closes the MAC and frees the dpaa2_mac object. It does not drop the endpoint device reference stored in mac->mc_dev, so every successful connect leaks that device reference when the MAC is later disconnected.
Drop the endpoint device reference before freeing the dpaa2_mac object.
Which versions are affected by CVE-2026-68333?
How do I fix CVE-2026-68333?
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-2026-68333 being exploited?
There is no known exploitation of CVE-2026-68333 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68333, DEBIAN-CVE-2026-68333, GHSA-w4qg-4v2q-4r8f, UBUNTU-CVE-2026-68333.