Linux Kernel Keyctl Parameters Buffer Overflow

Executive Summary

This vulnerability is in the Linux kernel's KEYS subsystem. It involves an overflow issue in the keyctl_pkey_params_get_2() function where the internal output buffer size is calculated incorrectly. This can lead to buffer overflow if a caller provides a buffer that is too small.

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Detection Guidance

This vulnerability is specific to the Linux kernel's KEYS subsystem and requires kernel-level inspection. Detection involves checking kernel version and KEYS subsystem behavior. Use uname -a to verify kernel version and grep for KEYS-related modules in /proc/modules. No direct commands detect this overflow without kernel debugging tools.

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Impact Analysis

If exploited, this vulnerability could allow an attacker to cause a buffer overflow in the Linux kernel. This might lead to system crashes, privilege escalation, or arbitrary code execution, depending on the attacker's goals and system configuration.

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Compliance Impact

This vulnerability involves an overflow in keyctl_pkey_params_get_2() due to incorrect buffer size calculation, which could lead to memory corruption or crashes. While not directly tied to GDPR or HIPAA, such vulnerabilities may impact compliance by compromising system integrity, potentially affecting data confidentiality and availability required by these regulations.

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Mitigation Strategies

Apply the latest kernel patch from your Linux distribution. If no patch is available, consider disabling keyctl_pkey_params_get_2() functionality or restrict access to KEYS operations. Monitor vendor advisories for updates.

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