NULL-pointer Dereference in Linux Kernel Power Sequencing Subsystem

Executive Summary

This vulnerability is a NULL-pointer dereference in the Linux kernel's power sequencing subsystem. It occurs in the pwrseq_device_register() function when dev_set_name() fails. The error causes the function to jump to an error label before initializing a critical list head (pwrseq->targets). Later, when pwrseq_release() tries to iterate over targets, it dereferences an uninitialized pointer, leading to a crash or potential code execution.

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Detection Guidance

This vulnerability is specific to the Linux kernel's power sequencing subsystem and requires kernel-level detection. Check if your kernel version includes the affected pwrseq_device_register function by examining kernel logs for NULL-pointer dereference errors related to power sequencing. Use commands like dmesg | grep -i pwrseq or journalctl -k | grep -i pwrseq to search for related errors.

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Impact Analysis

If exploited, this vulnerability could cause system instability, crashes, or unexpected behavior in the Linux kernel. It may lead to denial-of-service conditions or, in rare cases, privilege escalation if an attacker can trigger the NULL-pointer dereference.

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Compliance Impact

This vulnerability is a NULL-pointer dereference in the Linux kernel's power sequencing subsystem. It does not directly impact compliance with standards like GDPR or HIPAA as it is a low-level kernel issue affecting device initialization. Compliance risks would only arise if this flaw led to system instability or data corruption in systems handling sensitive data.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate updating is not possible, avoid using power sequencing devices or disable the pwrseq subsystem if not required. Monitor kernel logs for any signs of exploitation or crashes.

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