CVE-2026-80621 PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability
A null pointer dereference in the Linux kernel PCI DWC driver can cause a system crash when debugfs teardown occurs without RAS DES capability.
- 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-2026-80621?
CVE-2026-80621 is a 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:
PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability
dwc_pcie_rasdes_debugfs_init() returns success when the controller has no RAS DES capability, leaving pci->debugfs->rasdes_info unset. The common debugfs teardown path still calls dwc_pcie_rasdes_debugfs_deinit(), which dereferences rasdes_info unconditionally.
Return early when no RAS DES state was allocated. In that case no RAS DES mutex was initialized, so there is nothing to destroy.
[mani: reworded subject]
Which versions are affected by CVE-2026-80621?
How do I fix CVE-2026-80621?
Apply the vendor's patch.
Is CVE-2026-80621 being exploited?
There is no known exploitation of CVE-2026-80621 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80621, DEBIAN-CVE-2026-80621, GHSA-257h-4q39-v2v3, UBUNTU-CVE-2026-80621.