# CVE-2024-24856: NULL pointer deference in acpi_db_convert_to_package of Linux acpi module

CVE-2024-24856 is fixed in acpica-unix on 1 platform, first by DEBIAN-CVE-2024-24856, released April 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-24856
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2024
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-24856

## Description

The memory allocation function ACPI_ALLOCATE_ZEROED does not guarantee a successful allocation, but the subsequent code directly dereferences the pointer that receives it, which may lead to null pointer dereference.  To fix this issue, a null pointer check should be added. If it is null,  return exception code AE_NO_MEMORY.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | acpica-unix Debian 13.5 (trixie) | 20240827-2 | [DEBIAN-CVE-2024-24856](https://patchblox.com/security/data/fix/linux/debian-cve-2024-24856.md) | Apr 17, 2024 |
| Linux | acpica-unix Debian 14 | 20240827-2 | [DEBIAN-CVE-2024-24856](https://patchblox.com/security/data/fix/linux/debian-cve-2024-24856.md) | Apr 17, 2024 |

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