CVE-2026-53067 PCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc
A double-free vulnerability in the Linux kernel PCI endpoint MSI driver allows attackers to cause denial of service or potentially execute code via improper error handling.
- 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-2026-53067?
CVE-2026-53067 is a high-severity memory corruption vulnerability in Linux kernel, published on 24 Jun 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-ep-msi: Fix error unwind and prevent double alloc
pci_epf_alloc_doorbell() stores the allocated doorbell message array in epf->db_msg/epf->num_db before requesting MSI vectors. If MSI allocation fails, the array is freed but the EPF state may still point to freed memory.
Clear epf->db_msg and epf->num_db on the MSI allocation failure path so that later cleanup cannot double-free the array and callers can retry allocation.
Also return -EBUSY when doorbells have already been allocated to prevent leaking or overwriting an existing allocation.
Weakness: CWE-415
Which versions are affected by CVE-2026-53067?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53067?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-53067 being exploited?
There is no known exploitation of CVE-2026-53067 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53067, DEBIAN-CVE-2026-53067, GHSA-6325-fcfv-pxv6, UBUNTU-CVE-2026-53067.