CVE-2026-53067
PCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc
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.
INFO
Published Date :
June 24, 2026, 4:30 p.m.
Last Modified :
June 24, 2026, 4:30 p.m.
Remotely Exploit :
No
Source :
Linux
Affected Products
The following products are affected by CVE-2026-53067
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest version.
- Apply vendor-provided patches for PCI endpoint driver.
- Clear doorbell message pointers on allocation failure.
- Prevent double-freeing of doorbell message arrays.
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