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CVE-2025-21676

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: fec: handle page_pool_dev_alloc_pages error The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did not h…

Published Jan 31, 2025CWE-476EPSS 0.45%

Overview

CVE-2025-21676 is a high-severity vulnerability. It was published on January 31, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

net: fec: handle page_pool_dev_alloc_pages error

The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did

not handle the case when it returned NULL. There was a WARN_ON(!new_page)

but it would still proceed to use the NULL pointer and then crash.

This case does seem somewhat rare but when the system is under memory

pressure it can happen. One case where I can duplicate this with some

frequency is when writing over a smbd share to a SATA HDD attached to an

imx6q.

Setting /proc/sys/vm/min_free_kbytes to higher values also seems to solve

the problem for my test case. But it still seems wrong that the fec driver

ignores the memory allocation error and can crash.

This commit handles the allocation error by dropping the current packet.

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/001ba0902046cb6c352494df610718c0763e77a5Refgit.kernel.org/stable/c/1425cb829556398f594658512d49292f988a2ab0Refgit.kernel.org/stable/c/8a0097db0544b658c159ac787319737712063a23Refgit.kernel.org/stable/c/eacdcc14f3c8d4c1447565521e792ddb3a67e08dRefcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21676?

CVE-2025-21676 is a high-severity vulnerability. It was published on January 31, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-21676?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21676?

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-2025-21676?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21676 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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