CVE-2026-53067 Details
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.
A vulnerability in the Linux kernel's PCI endpoint management can lead to improper handling of doorbell message allocations. The issue arises in the 'pci-ep-msi' component, where the function 'pci_epf_alloc_doorbell' allocates a doorbell message array and stores it in the endpoint's state. If the allocation of Message Signaled Interrupts (MSI) fails, the array is freed, but the endpoint state may still reference this freed memory. This can cause a double-free error during cleanup. The vulnerability affects several versions of the Linux kernel.
The vulnerability has been addressed in the Linux kernel. Users should upgrade to the latest version where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/175717cfc06cab79f84cd037d66dda1b8564cd9e | kernel.org | Patch |
| https://git.kernel.org/stable/c/1cba96c0a795124c3229293ed7b5b5765e66f259 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3c25587fbf8797b92090b064a6d239a873e55fb1 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-415 | Double Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.17, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 21, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |