CVE-2026-43281
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Out-of-Bounds Access in Linux Kernel Mailbox Subsystem

Publication date: 2026-05-06

Last updated on: 2026-05-06

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate() Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-06
Generated
2026-05-07
AI Q&A
2026-05-06
EPSS Evaluated
N/A
NVD
CVE-2026-43281
EUVD
EUVD-2026-27680
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability exists in the Linux kernel's mailbox subsystem, specifically in the function fw_mbox_index_xlate(). The issue arises when the device tree specifies '#mbox-cells' as 0, which is against the guidance that it should be at least 1. If the mailbox controller does not provide certain function pointers (fw_xlate and of_xlate), the default fw_mbox_index_xlate() function is used without proper bounds checking. This can lead to out-of-bounds memory access.


How can this vulnerability impact me? :

The vulnerability can cause out-of-bounds memory access in the Linux kernel mailbox subsystem. This may lead to system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service, depending on the context in which the mailbox is used.


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