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

CVE-2026-97423 is fixed in linux on 1 platform by DEBIAN-CVE-2026-97423 (version 7.2.6-1), released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-97423
- Priority: Routine
- CVSS: 6.3 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97423

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-97423](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97423.md) | Sep 24, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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