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Important Linux Kernel Vulnerability Patched in All Supported Ubuntu OSes

A single kernel vulnerability (CVE-2015-3339) has been patched in the upstream Linux kernels used in all supported Ubuntu operating systems. It was discovered that a race condition between Linux kernel’s execve() and chown() functions could allow a local attacker to gain root privileges by using chown on a setuid-user-binary. The priority of this bug was marked as high, which means that all Ubuntu users are urged to update their systems immediately.