s390/pkey PKEY_VERIFYPROTK ioctl Length Validation Flaw

Executive Summary

This vulnerability in the Linux kernel involves insufficient validation of user-provided buffer lengths in the PKEY_VERIFYPROTK ioctl. The kernel fails to properly check if the requested buffer size exceeds the actual allocated memory, which could lead to buffer overflow conditions.

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Detection Guidance

This vulnerability is specific to the Linux kernel's s390/pkey module and involves improper buffer length checks in the PKEY_VERIFYPROTK ioctl. Detection requires checking the kernel version and verifying if the vulnerable code path exists. Use commands like 'uname -r' to check the kernel version and 'grep PKEY_VERIFYPROTK /proc/kallsyms' to see if the function is present.

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Impact Analysis

An attacker with local access could exploit this flaw to execute arbitrary code, escalate privileges, or cause a denial of service by triggering a buffer overflow. This may lead to system instability or unauthorized access to sensitive data.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. The issue is a local privilege escalation flaw in the Linux kernel's s390/pkey component, which could allow unauthorized access to sensitive data on affected systems. However, its impact on compliance depends on system-specific configurations and whether unauthorized access occurs.

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Mitigation Strategies

Immediately update the Linux kernel to a patched version that resolves this issue. If updating is not immediately possible, consider disabling the s390/pkey module if it is not required. Monitor vendor advisories for kernel updates addressing this CVE.

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