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CVE-2025-21734

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix copy buffer page size For non-registered buffer, fastrpc driver copies the buffer and pass it to the remote…

Published Feb 27, 2025CWE-787EPSS 0.21%

Overview

CVE-2025-21734 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:

misc: fastrpc: Fix copy buffer page size

For non-registered buffer, fastrpc driver copies the buffer and

pass it to the remote subsystem. There is a problem with current

implementation of page size calculation which is not considering

the offset in the calculation. This might lead to passing of

improper and out-of-bounds page size which could result in

memory issue. Calculate page start and page end using the offset

adjusted address instead of absolute address.

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/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51Refgit.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55Refgit.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4Refgit.kernel.org/stable/c/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623Refgit.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66Reflists.debian.org/debian-lts-announce/2025/03/msg00028.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21734?

CVE-2025-21734 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-2025-21734?

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-2025-21734?

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-2025-21734?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21734 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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