CVE-2026-53067

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1c3b002c6bf684b445a7107609979bca5f21bc03 < 175717cfc06cab79f84cd037d66dda1b8564cd9eaffected
LinuxLinux1c3b002c6bf684b445a7107609979bca5f21bc03 < 3c25587fbf8797b92090b064a6d239a873e55fb1affected
LinuxLinux1c3b002c6bf684b445a7107609979bca5f21bc03 < 1cba96c0a795124c3229293ed7b5b5765e66f259affected
LinuxLinux6.17affected
LinuxLinux0 < 6.17unaffected
LinuxLinux6.18.33 <= 6.18.*unaffected
LinuxLinux7.0.10 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References