Print-Path RCE Exposed: Critical HP Linux Driver Flaws (CVE-2026-8631) Grant Root Privileges
Do Son 
A fresh security advisory has issued an urgent warning for open-source environments and enterprise Linux deployments utilizing Hewlett-Packard hardware. Multiple high-severity security vulnerabilities have been identified within the HP Linux Imaging and Printing (HPLIP) software suite, the default driver framework used to interface Linux operating systems with HP printers and scanners.
The discovered flaws introduce dangerous code execution vectors, giving threat actors the ability to silently compromise local workstations or pivot across production network segments.
The most severe vulnerability, tracked as CVE-2026-8631, discovered in the suite carries a Critical CVSS base score of 9.3. Operating within the network communication plane, the bug introduces a classic memory corruption vulnerability inside the driver’s primary parsing component.
Specifically, an integer overflow flaw resides within the hpcups processing path, the subsystem responsible for translating incoming document data into rasterized print instructions. An unauthenticated network attacker can exploit this boundary failure by sending specially crafted print data directly to an exposed printer service. When the driver processes the malformed payload, the integer overflow triggers, allowing the attacker to bypass system memory limits to achieve full local privilege escalation or arbitrary code execution natively on the host machine.
Operating alongside the print-path flaw is CVE-2026-8632, which carries a High-severity CVSS score of 8.5. This vulnerability allows a local user with minimal, non-administrative privileges to bypass access controls and escalate their permissions to root authority. The exploit path leverages an input validation failure within the underlying operating system script wrappers, enabling command injection or buffer overflow states to execute arbitrary system commands with elevated privileges.
Because HPLIP comes pre-installed across dozens of major enterprise Linux distributions, the passive exposure footprint is extensive. Security teams are strongly urged to audit endpoint software inventories immediately, restrict network access to local print server ports, and apply the latest upstream driver updates provided by HP to seal these execution vectors.
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