CVE-2026-97434 dpaa2-switch: fix handling of NAPI on the remove path
A use-after-free vulnerability in the Linux kernel dpaa2-switch driver allows local attackers to cause a denial of service or potentially execute code during device removal.
- 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-2026-97434?
CVE-2026-97434 is an use after free vulnerability in Linux, published on 24 Sep 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: fix handling of NAPI on the remove path
All the NAPI instances for a DPSW device are attached to the first switch port's net_device but shared by all ports. The NAPI instances get disabled only once the last port goes down.
This causes an issue on the .remove() path where each port is unregistered and freed one at a time, causing the NAPI instances to be deleted even though they are not disabled.
In order to avoid this, split up the unregister_netdev() calls from the free_netdev() so that we make sure all ports go down before we attempt a deletion of NAPI instances. Also, make the netif_napi_del() explicit as it is on the .probe() path.
Which versions are affected by CVE-2026-97434?
How do I fix CVE-2026-97434?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-97434 being exploited?
There is no known exploitation of CVE-2026-97434 in the wild and no public exploit code.
Sources
Also known as AZL-103610, BELL-CVE-2026-97434, DEBIAN-CVE-2026-97434, GHSA-pf43-5wcw-xwvc, UBUNTU-CVE-2026-97434.