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CVE-2025-71135

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt() The variable mddev->private is first assigne…

Published Jan 14, 2026CWE-476EPSS 0.18%

Overview

CVE-2025-71135 is a medium-severity vulnerability. It was published on January 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()

The variable mddev->private is first assigned to conf and then checked:

conf = mddev->private;

if (!conf) ...

If conf is NULL, then mddev->private is also NULL. In this case,

null-pointer dereferences can occur when calling raid5_quiesce():

raid5_quiesce(mddev, true);

raid5_quiesce(mddev, false);

since mddev->private is assigned to conf again in raid5_quiesce(), and conf

is dereferenced in several places, for example:

conf->quiesce = 0;

wake_up(&conf->wait_for_quiescent);

To fix this issue, the function should unlock mddev and return before

invoking raid5_quiesce() when conf is NULL, following the existing pattern

in raid5_change_consistency_policy().

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/20597b7229aea8b5bc45cd92097640257c7fc33bRefgit.kernel.org/stable/c/7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9Refgit.kernel.org/stable/c/e5abb6af905de6b2fead8a0b3f32ab0b81468a01

How CyberStrike helps

Frequently asked questions

What is CVE-2025-71135?

CVE-2025-71135 is a medium-severity vulnerability. It was published on January 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-71135?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-71135?

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-2025-71135?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-71135 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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