# CVE-2022-48894: linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/arm-smmu-v3: Don't unregister on shutdown...

CVE-2022-48894 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48894, released August 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48894
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommu/arm-smmu-v3: Don't unregister on shutdown  Similar to SMMUv2, this driver calls iommu_device_unregister() from the shutdown path, which removes the IOMMU groups with no coordination whatsoever with their users - shutdown methods are optional in device drivers. This can lead to NULL pointer dereferences in those drivers' DMA API calls, or worse.  Instead of calling the full arm_smmu_device_remove() from arm_smmu_device_shutdown(), let's pick only the relevant function call - arm_smmu_device_disable() - more or less the reverse of arm_smmu_device_reset() - and call just that from the shutdown path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.7-1 | [DEBIAN-CVE-2022-48894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48894.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.7-1 | [DEBIAN-CVE-2022-48894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48894.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.7-1 | [DEBIAN-CVE-2022-48894](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48894.md) | Aug 21, 2024 |

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