# CVE-2022-48707: linux: In the Linux kernel, the following vulnerability has been resolved:  cxl/region: Fix null pointer dereference for res...

CVE-2022-48707 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48707, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48707
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  cxl/region: Fix null pointer dereference for resetting decoder  Not all decoders have a reset callback.  The CXL specification allows a host bridge with a single root port to have no explicit HDM decoders. Currently the region driver assumes there are none.  As such the CXL core creates a special pass through decoder instance without a commit/reset callback.  Prior to this patch, the ->reset() callback was called unconditionally when calling cxl_region_decode_reset. Thus a configuration with 1 Host Bridge, 1 Root Port, and one directly attached CXL type 3 device or multiple CXL type 3 devices attached to downstream ports of a switch can cause a null pointer dereference.  Before the fix, a kernel crash was observed when we destroy the region, and a pass through decoder is reset.  The issue can be reproduced as below,     1) create a region with a CXL setup which includes a HB with a     single root port under which a memdev is attached directly.     2) destroy the region with cxl destroy-region regionX -f.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.12-1 | [DEBIAN-CVE-2022-48707](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48707.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.12-1 | [DEBIAN-CVE-2022-48707](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48707.md) | May 21, 2024 |
| Linux | linux Debian 14 | 6.1.12-1 | [DEBIAN-CVE-2022-48707](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48707.md) | May 21, 2024 |

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