CVE-2026-53295 mailbox: add sanity check for channel array

What is CVE-2026-53295?

CVE-2026-53295 is a medium-severity vulnerability in Linux kernel, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2026-53295?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53295?

Apply the vendor's patch.

Is CVE-2026-53295 being exploited?

There is no known exploitation of CVE-2026-53295 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-53295, DEBIAN-CVE-2026-53295, GHSA-rf57-3w24-v5g9, ROOT-OS-UBUNTU-2204-CVE-2026-53295, ROOT-OS-UBUNTU-2404-CVE-2026-53295, UBUNTU-CVE-2026-53295.