CVE intelligence

CVE-2026-43274

Vulnerability intelligence

Published May 6, 2026Sources checked Nov 14, 2026

8.4HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-43274 and is rated High severity with a CVSS score of 8.4. 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: May 9, 2026

CBL-Mariner Releases

Vendor-listed releases

6.6.137.1-2

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-2026-43274?

In the Linux kernel, the following vulnerability has been resolved:

mailbox: mchp-ipc-sbi: fix out-of-bounds access in mchp_ipc_get_cluster_aggr_irq()

The cluster_cfg array is dynamically allocated to hold per-CPU configuration structures, with its size based on the number of online CPUs. Previously, this array was indexed using hartid, which may be non-contiguous or exceed the bounds of the array, leading to out-of-bounds access.

Switch to using cpuid as the index, as it is guaranteed to be within the valid range provided by for_each_online_cpu().

Source: NVD