# CVE-2022-49894: linux: In the Linux kernel, the following vulnerability has been resolved:  cxl/region: Fix region HPA ordering validation...

CVE-2022-49894 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49894, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49894
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  cxl/region: Fix region HPA ordering validation  Some regions may not have any address space allocated. Skip them when validating HPA order otherwise a crash like the following may result:   devm_cxl_add_region: cxl_acpi cxl_acpi.0: decoder3.4: created region9  BUG: kernel NULL pointer dereference, address: 0000000000000000  [..]  RIP: 0010:store_targetN+0x655/0x1740 [cxl_core]  [..]  Call Trace:   <TASK>   kernfs_fop_write_iter+0x144/0x200   vfs_write+0x24a/0x4d0   ksys_write+0x69/0xf0   do_syscall_64+0x3a/0x90  store_targetN+0x655/0x1740: alloc_region_ref at drivers/cxl/core/region.c:676 (inlined by) cxl_port_attach_region at drivers/cxl/core/region.c:850 (inlined by) cxl_region_attach at drivers/cxl/core/region.c:1290 (inlined by) attach_target at drivers/cxl/core/region.c:1410 (inlined by) store_targetN at drivers/cxl/core/region.c:1453

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.8-1 | [DEBIAN-CVE-2022-49894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49894.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.8-1 | [DEBIAN-CVE-2022-49894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49894.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.8-1 | [DEBIAN-CVE-2022-49894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49894.md) | May 1, 2025 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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