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Ubuntu LTS 'kill' Command Bug Lingers Across Releases for a Decade, Investigation Finds

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A flaw in the 'kill' command, a core Unix process-management tool, has reportedly persisted across Ubuntu LTS releases 14, 16, 18, 22, and 24 for over ten years. The defect mishandles signal delivery, which can leave processes unterminated, hang the system, or trigger unintended restarts. According to an investigation by Alan Grow, the bug slipped through inadequate testing, was carried forward through code replication without revalidation, and relied on outdated documentation. Reports were also reportedly overlooked or misclassified in bug tracking, delaying a fix. Because LTS releases are widely used in enterprises and critical infrastructure, the authors argue the issue poses both reliability concerns and potential security risks, and call for stronger reviews, automated regression testing, and more transparent bug tracking.

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