Mailbox Controller Channel Array Sanity Check Failure

Publication date: 2026-06-26

Last updated on: 2026-07-08

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: add sanity check for channel array Fail gracefully if there is no channel array attached to the mailbox controller. Otherwise the later dereference will cause an OOPS which might not be seen because mailbox controllers might instantiate very early. Remove the comment explaining the obvious while here.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-26

Last Modified

2026-07-08

Generated

2026-07-17

AI Q&A

2026-06-26

EPSS Evaluated

2026-07-15

NVD

CVE-2026-53295

EUVD

EUVD-2026-39900

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	3.18
linux	linux_kernel	7.1
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
linux	linux_kernel	From 6.2 (inc) to 6.6.141 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.91 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.33 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.10 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 3.18.1 (inc) to 5.10.258 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's mailbox subsystem. It occurs when there is no channel array attached to the mailbox controller, and the system attempts to dereference this non-existent array. This leads to an OOPS, which is a kernel error that can cause the system to crash or behave unexpectedly. The fix involves adding a sanity check to ensure the channel array exists before it is accessed, allowing the system to fail gracefully instead of crashing.

Impact Analysis

If this vulnerability is triggered, it can cause the Linux kernel to experience an OOPS, which is a serious error that may lead to system instability or crashes. Since mailbox controllers might initialize very early during system startup, this issue might not be immediately visible but can affect system reliability and availability.

Hi! I’m here to help you understand CVE-2026-53295. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70