CVE-2026-46009 PCI: endpoint: pci-epf-ntb: Remove duplicate resource teardown
A duplicate resource teardown in the Linux kernel PCI endpoint NTB driver causes a system crash when link operations fail.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46009?
CVE-2026-46009 is a medium-severity vulnerability in Linux kernel, published on 27 May 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: endpoint: pci-epf-ntb: Remove duplicate resource teardown
epf_ntb_epc_destroy() duplicates the teardown that the caller is supposed to do later. This leads to an oops when .allow_link fails or when .drop_link is performed. Remove the helper.
Also drop pci_epc_put(). EPC device refcounting is tied to configfs EPC group lifetime, and pci_epc_put() in the .drop_link path is sufficient.
Which versions are affected by CVE-2026-46009?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46009?
Apply the vendor's patch.
Is CVE-2026-46009 being exploited?
There is no known exploitation of CVE-2026-46009 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88434, BELL-CVE-2026-46009, DEBIAN-CVE-2026-46009, GHSA-4fp6-v282-8q64, ROOT-OS-DEBIAN-12-CVE-2026-46009, ROOT-OS-UBUNTU-2204-CVE-2026-46009 and 2 more.