Published Jun 26, 2026Sources checked Nov 12, 2026
5.5MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-53295 and is rated Medium severity with a CVSS score of 5.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Jul 9, 2026
CBL-Mariner Releases
Vendor-listed releases
6.6.143.1-1
CISA KEVNot listedBased on the latest collected catalog
EPSS0.1%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-53295?
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.