Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-24T00:00:00 kernel: PCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-1341

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.

A flaw was found in the Linux kernel's PCI (Peripheral Component Interconnect) endpoint Message Signaled Interrupts (MSI) doorbell allocation. When MSI allocation fails, the system may attempt to free already freed memory, leading to a double-free vulnerability. This issue can result in memory corruption or a denial of service (DoS) condition, making the system unstable or unresponsive. Additionally, improper handling of already allocated doorbells could lead to memory leaks or overwriting existing allocations.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53067 https://nvd.nist.gov/vuln/detail/CVE-2026-53067 https://lore.kernel.org/linux-cve-announce/2026062403-CVE-2026-53067-ec86@gregkh/T