CVE-2026-80654
Received Received - Intake

Xilinx Linux Kernel Mailbox Channel Use-After-Free

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: soc: xilinx: Shutdown and free rx mailbox channel A mbox rx channel is requested using mbox_request_channel_byname() in probe. In remove callback, the rx mailbox channel is cleaned up when the rx_chan is NULL due to incorrect condition check. The mailbox channel is not shutdown and it can receive messages even after the device removal. This leads to use after free. Also the channel resources are not freed. Fix this by checking the rx_chan correctly.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-09-17
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-80654
EUVD
EUVD-2026-67530

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
xilinx shutdown_and_free_rx_mailbox_channel *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper cleanup of a mailbox receive channel during device removal. When a device is removed, the code incorrectly checks if the receive channel is NULL before freeing it, allowing the channel to remain active and receive messages even after the device is gone. This leads to a use-after-free condition where freed memory is accessed, causing potential system instability or crashes.

Detection Guidance

This vulnerability is specific to the Linux kernel's Xilinx mailbox driver. Detection requires checking kernel logs for errors related to mailbox channel handling or use-after-free events in the Xilinx subsystem.

Impact Analysis

This vulnerability could cause system crashes or instability if the affected device is removed while still receiving messages. It may also lead to memory corruption or privilege escalation if exploited by an attacker to manipulate freed memory. Systems relying on the Xilinx mailbox functionality could experience unexpected behavior or failures.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it pertains to a Linux kernel mailbox channel use-after-free issue in Xilinx hardware. No evidence suggests data privacy or security compliance impacts from this specific flaw.

Mitigation Strategies

Apply the kernel patch fixing the incorrect condition check in the Xilinx mailbox driver's remove callback. Update to a patched kernel version if available.

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