CVE-2026-90319 rapidio: clear mport->net when rio_add_net() fails
A use-after-free vulnerability in the Linux kernel RapidIO subsystem allows local attackers to cause a denial of service or potentially execute code via dangling pointer dereference.
- 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-2026-90319?
CVE-2026-90319 is an use after free vulnerability in Linux, published on 17 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:
rapidio: clear mport->net when rio_add_net() fails
rio_alloc_net() stores the newly allocated rio_net in mport->net before rio_scan_alloc_net() registers the device.
If rio_add_net() fails, rio_scan_alloc_net() drops the device reference with put_device(), which releases the rio_net through the device release callback. However, mport->net is left pointing at the freed object.
A later mport unregister path can then dereference the dangling mport->net pointer and may try to free the same rio_net again.
Clear mport->net in the rio_add_net() failure path, matching the cleanup done for the destID table allocation failure path.
Which versions are affected by CVE-2026-90319?
How do I fix CVE-2026-90319?
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-2026-90319 being exploited?
There is no known exploitation of CVE-2026-90319 in the wild and no public exploit code.
Sources
Also known as AZL-101879, BELL-CVE-2026-90319, DEBIAN-CVE-2026-90319, GHSA-2x23-jxch-r563, UBUNTU-CVE-2026-90319.