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CVE-2025-38506

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: Allow CPU to reschedule while setting per-page memory attributes When running an SEV-SNP guest with a sufficiently large a…

Published Aug 16, 2025CWE-667EPSS 0.12%

Overview

CVE-2025-38506 is a medium-severity vulnerability. It was published on August 16, 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:

KVM: Allow CPU to reschedule while setting per-page memory attributes

When running an SEV-SNP guest with a sufficiently large amount of memory (1TB+),

the host can experience CPU soft lockups when running an operation in

kvm_vm_set_mem_attributes() to set memory attributes on the whole

range of guest memory.

watchdog: BUG: soft lockup - CPU#8 stuck for 26s! [qemu-kvm:6372]

CPU: 8 UID: 0 PID: 6372 Comm: qemu-kvm Kdump: loaded Not tainted 6.15.0-rc7.20250520.el9uek.rc1.x86_64 #1 PREEMPT(voluntary)

Hardware name: Oracle Corporation ORACLE SERVER E4-2c/Asm,MB Tray,2U,E4-2c, BIOS 78016600 11/13/2024

RIP: 0010:xas_create+0x78/0x1f0

Code: 00 00 00 41 80 fc 01 0f 84 82 00 00 00 ba 06 00 00 00 bd 06 00 00 00 49 8b 45 08 4d 8d 65 08 41 39 d6 73 20 83 ed 06 48 85 c0 <74> 67 48 89 c2 83 e2 03 48 83 fa 02 75 0c 48 3d 00 10 00 00 0f 87

RSP: 0018:ffffad890a34b940 EFLAGS: 00000286

RAX: ffff96f30b261daa RBX: ffffad890a34b9c8 RCX: 00

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/1ef45ae7a3938f0844032ba670b4f89180a5bffcRefgit.kernel.org/stable/c/47bb584237cc285e3a860b70c01f7bda9dcfb05bRefgit.kernel.org/stable/c/d9bd1163c8d8f716f45e54d034ee28757cc85549

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38506?

CVE-2025-38506 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38506?

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-2025-38506?

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-2025-38506?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38506 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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