CVE-2026-53067
UnknownSummary
A vulnerability related to the allocation of the doorbell message array in PCI has been fixed in the Linux kernel. In case of MSI allocation failure, pointers may reference freed memory, leading to potential errors.
Risk Assessment
Organizations may be exposed to memory issues, which could result in system crashes or unexpected behavior of applications utilizing PCI.
Recommendation
It is recommended to update the Linux kernel to the latest version to mitigate this vulnerability and monitor systems for abnormal behavior related to memory allocation.
Original NVD description (English source)
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.