Unbalanced Lock in Linux Kernel GPU SVM

Executive Summary

This is a Linux kernel vulnerability where a function called drm_gpusvm_scan_mm() has an unbalanced lock/unlock issue. Specifically, the drm_gpusvm_notifier_unlock() is placed under an error handling label, but the first jump to this label occurs just before acquiring the lock, leading to an attempt to release a lock that was never acquired.

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Detection Guidance

This vulnerability is specific to the Linux kernel's drm/gpusvm component and may not have direct network detection methods. Check kernel logs for warnings about unbalanced lock/unlock operations in drm_gpusvm_scan_mm using: dmesg | grep -i 'unbalanced lock' or journalctl -k | grep -i 'unbalanced lock'.

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Impact Analysis

This vulnerability could cause kernel instability or crashes due to improper lock handling. It may lead to system freezes, unexpected reboots, or potential denial-of-service conditions if exploited.

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Compliance Impact

This vulnerability involves an unbalanced lock/unlock in the Linux kernel's GPU SVM (Shared Virtual Memory) subsystem, which could lead to system instability or crashes. It does not directly affect data privacy or security controls required by standards like GDPR or HIPAA.

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Mitigation Strategies

Apply the latest kernel update that includes the fix for CVE-2026-63863. If unavailable, avoid using drm/gpusvm features until patched. Monitor kernel logs for related errors as a sign of exploitation.

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