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 126.96.36.199 or 188.8.131.52.
Provided and/or discovered by: Wojciech Purczynskiof iSEC Security Research and qaaz
Original Advisory: iSEC Security Research:
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Subject: Linux Kernel "vmsplice()" System Call Vulnerabilities
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