Ubuntu has issued an update for the kernel. This fixes multiple vulnerabilities, which can be exploited by malicious, local users to compromise a vulnerable system and by malicious people to cause a DoS (Denial of Service).
1) An error exists within Ext4 "move extents" ioctl, which can be exploited to overwrite arbitrary files on the system.
2) Due to an error within the "ip_defrag()" function in net/ipv4/ip_fragment.c a NULL pointer dereference can occur, which can potentially be exploited by sending overly large packets to a vulnerable system.
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Subject: Ubuntu update for kernel
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