CVE-2025-21833: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE There is a WARN_ON_ONCE to catch an unlikely situation when domain_remove_dev_pasid can't find the `pasid`. In case it nevertheless happens we must avoid using a NULL pointer.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 6.13.3

References

Advisories & Patches

https://git.kernel.org/stable/c/60f030f7418d3f1d94f2fb207fe3080e1844630b https://git.kernel.org/stable/c/df96876be3b064aefc493f760e0639765d13ed0d

Other References

https://git.kernel.org/stable/c/68ec78beb4a3fb0877cbaaf49758c85410c05977

Frequently Asked Questions

What is CVE-2025-21833? +

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE There is a WARN_ON_ONCE to catch an unlikely situation when domain_remove_dev_pasid can't find the `pasid`. In case it nevertheless happens we must avoid using a NULL pointer. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21833? +

CVE-2025-21833 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21833? +

CVE-2025-21833 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21833? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-21833