CVE-2026-93278 staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown
A use-after-free vulnerability in the Linux kernel Octeon driver allows local attackers to cause a system crash by triggering a race condition 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-2026-93278?
CVE-2026-93278 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:
staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown
cvm_oct_rx_shutdown calls free_irq and netif_napi_del without disabling the napi instance first. As the free_irq only waits for completion of hard interrupt handlers, the napi poll function could still be active. If cvm_oct_remove proceeds to free the plat structure (which holds the NAPI instances), the active poll function will access freed memory, resulting in a use-after-free crash.
Which versions are affected by CVE-2026-93278?
How do I fix CVE-2026-93278?
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-2026-93278 being exploited?
There is no known exploitation of CVE-2026-93278 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93278, DEBIAN-CVE-2026-93278, GHSA-7ppg-qghw-hg2g, UBUNTU-CVE-2026-93278.