CVE-2026-43281
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Out-of-Bounds Access in Linux Kernel Mailbox Subsystem
Vulnerability report for CVE-2026-43281, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-05-06
Last updated on: 2026-06-01
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | From 6.2 (inc) to 6.6.130 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.77 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.16 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 6.19.6 (exc) |
| linux | linux_kernel | From 3.18.1 (inc) to 6.1.167 (exc) |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | 3.18 |
| linux | linux_kernel | 3.18 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
