Race Condition in Linux Kernel KVM s390

Executive Summary

This is a race condition vulnerability in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for s390 architecture. It occurs in the try_get_locked_pte() function when page table entries (puds or pmds) are unmapped between p?dp_get() and p?d_offset() calls, potentially leading to incorrect memory access.

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Detection Guidance

This vulnerability is specific to the Linux kernel's KVM s390 implementation and involves a race condition in memory management. Detection requires checking kernel logs for related errors or kernel crashes, particularly after applying patches. Commands like dmesg, journalctl -k, or checking /var/log/kern.log may reveal issues. Ensure your kernel is updated to the patched version.

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Impact Analysis

This vulnerability could allow a malicious guest VM to cause a denial of service or potentially escalate privileges on the host system by exploiting the race condition in memory management.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel memory management issue with no documented impact on data protection or privacy controls.

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Mitigation Strategies

Apply the Linux kernel patch that resolves this issue. Update to a version of the Linux kernel that includes the fix for the race condition in try_get_locked_pte().

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