CVE-2026-43221 ipmi: ipmb: initialise event handler read bytes

What is CVE-2026-43221?

CVE-2026-43221 is a medium-severity vulnerability in Linux kernel, published on 6 May 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:

ipmi: ipmb: initialise event handler read bytes

IPMB doesn't use i2c reads, but the handler needs to set a value. Otherwise an i2c read will return an uninitialised value from the bus driver.

Weakness: CWE-908

Which versions are affected by CVE-2026-43221?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43221?

Apply the vendor's patch.

Is CVE-2026-43221 being exploited?

There is no known exploitation of CVE-2026-43221 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-2026-43221, DEBIAN-CVE-2026-43221, GHSA-vqpg-cfxc-r52f, ROOT-OS-UBUNTU-2404-CVE-2026-43221, UBUNTU-CVE-2026-43221.