Linux developers have strongly recommended anyone who uses Linux kernel 2.6.25 on multi-user x86-64 systems to upgrade to version 2.6.25.11. It appears that users with restricted privileges are able to escalate their access privileges. While Greg Kroah-Hartman did not give any further details when announcing the new kernel version, the problem is likely to be caused by the filtering of the Local Descriptor Table (LDT).
Several vulnerabilities closed in the Linux kernel - News - heise Security UK
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