What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-908

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.

Affected products

• Linux kernel: from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 7.0-rc1 — fixed in 6.1.165, 6.12.75, 6.18.16, 6.19.6, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 6.1.165, 6.12.75, 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/102712417bb6aa9a00d852bc59cb0a276db486c4
• https://git.kernel.org/stable/c/2dfbc8c17dd161885336e77e71c336cd62cf6748
• https://git.kernel.org/stable/c/56d5c0557e53c4d8d92a619fa83eaae178165e07
• https://git.kernel.org/stable/c/905554ebd76aeee370bfd5136ea11e0b9d75c6f1
• https://git.kernel.org/stable/c/9f235ccecd03c436cb1683eac16b12f119e54aa9
• https://git.kernel.org/stable/c/f726b3a57e00bb6249c67714c11ae8b4b31719a1

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