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CVE-2025-39715

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: parisc: Revise gateway LWS calls to probe user read access We use load and stbys,e instructions to trigger memory reference int…

Published Sep 5, 2025EPSS 0.15%

Overview

CVE-2025-39715 is a medium-severity vulnerability. It was published on September 5, 2025 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:

parisc: Revise gateway LWS calls to probe user read access

We use load and stbys,e instructions to trigger memory reference

interruptions without writing to memory. Because of the way read

access support is implemented, read access interruptions are only

triggered at privilege levels 2 and 3. The kernel and gateway

page execute at privilege level 0, so this code never triggers

a read access interruption. Thus, it is currently possible for

user code to execute a LWS compare and swap operation at an

address that is read protected at privilege level 3 (PRIV_USER).

Fix this by probing read access rights at privilege level 3 and

branching to lws_fault if access isn't allowed.

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/8bccf47adbf658293528e86960e6d6f736b1c9f7Refgit.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305fRefgit.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6Refgit.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194dRefgit.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8Reflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-032379.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39715?

CVE-2025-39715 is a medium-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39715?

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-2025-39715?

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-2025-39715?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39715 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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