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CVE-2026-63863

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm() There is a unbalanced lock/unlock to gpusvm notifier lock: [ 931.045…

Published Jul 19, 2026EPSS 0.17%

Overview

CVE-2026-63863 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

drm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm()

There is a unbalanced lock/unlock to gpusvm notifier lock:

[ 931.045868] =====================================

[ 931.046509] WARNING: bad unlock balance detected!

[ 931.047149] 6.19.0-rc6+xe-**************** #9 Tainted: G U

[ 931.048150] -------------------------------------

[ 931.048790] kworker/u5:0/51 is trying to release lock (&gpusvm->notifier_lock) at:

[ 931.049801] [<ffffffffa090c0d8>] drm_gpusvm_scan_mm+0x188/0x460 [drm_gpusvm_helper]

[ 931.050802] but there are no more locks to release!

[ 931.051463]

The drm_gpusvm_notifier_unlock() sits under err_free label and the

first jump to err_free is just before calling the

drm_gpusvm_notifier_lock() causing unbalanced unlock.

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/8efaa47a871662a8c21b819cec60786f7ef17ab4Refgit.kernel.org/stable/c/d287dee565c3c32e1ed76ec1847af46809c29b90

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63863?

CVE-2026-63863 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-63863?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-63863?

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-2026-63863?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63863 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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