What’s Vulnerable › Vulnerabilities

CVE-2026-43281: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Linux kernel: from 3.18.1 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 3.18, 3.18-rc2, 3.18-rc3, 3.18-rc4, 3.18-rc5, 3.18-rc6 (+1) — fixed in 6.1.167, 6.12.77, 6.18.16, 6.19.6, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.77, 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

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

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