Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service), disclose potentially sensitive information, and gain escalated privileges.

The vulnerabilities are caused due to the missing verification of parameters within the "vmsplice_to_user()", "copy_from_user_mmap_sem()", and "get_iovec_page_array()" functions in fs/splice.c before using them to perform certain memory operations. This can be exploited to e.g. read or write to arbitrary kernel memory via a specially crafted "vmsplice()" system call.

Successful exploitation allows attackers to e.g. gain "root" privileges.

Note: The affected system call first appeared in version 2.6.17.

Solution
Update to version 2.6.23.16 or 2.6.24.2.

Provided and/or discovered by
Wojciech Purczynskiof iSEC Security Research and qaaz

Original Advisory
iSEC Security Research:
http://www.isec.pl/vulnerabilities/isec-0026-vmsplice_to_kernel.txt

qaaz:
http://milw0rm.com/exploits/5092
http://milw0rm.com/exploits/5093

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