The FreeBSD developers have released new updates to their operating system to close three vulnerabilities. Users with restricted privileges can reportedly exploit all three holes to elevate their privileges. One of the vulnerabilities is caused by a design flaw recently also discovered and fixed in the kernel. It allows programming flaws to cause a NULL pointer dereference. A function pointer will in this case point to the (virtual) address 0, which is allocated to userland. This enables users to execute code at kernel privilege level.

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