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CVE-2025-21724

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() Resolve a UBSAN shift-out-of-bounds issue in iova…

Published Feb 27, 2025CWE-787EPSS 0.19%

Overview

CVE-2025-21724 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()

Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index()

where shifting the constant "1" (of type int) by bitmap->mapped.pgshift

(an unsigned long value) could result in undefined behavior.

The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds

31 (e.g., pgshift = 63) the shift operation overflows, as the result

cannot be represented in a 32-bit type.

To resolve this, the constant is updated to "1UL", promoting it to an

unsigned long type to match the operand's type.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/38ac76fc06bc6826a3e4b12a98efbe98432380a9Refgit.kernel.org/stable/c/44d9c94b7a3f29a3e07c4753603a35e9b28842a3Refgit.kernel.org/stable/c/b1f8453b8ff1ab79a03820ef608256c499769cb6Refgit.kernel.org/stable/c/d5d33f01b86af44b23eea61ee309e4ef22c0cdfeRefgit.kernel.org/stable/c/e24c1551059268b37f6f40639883eafb281b8b9cReflists.debian.org/debian-lts-announce/2025/03/msg00028.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21724?

CVE-2025-21724 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21724?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21724?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21724?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21724 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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