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USN-869-1: Linux kernel vulnerabilities

10 December 2009

Linux kernel vulnerabilities




David Ford discovered that the IPv4 defragmentation routine did not
correctly handle oversized packets. A remote attacker could send
specially crafted traffic that would cause a system to crash, leading
to a denial of service. (The fix was included in the earlier kernels
from USN-864-1.) (CVE-2009-1298)

Akira Fujita discovered that the Ext4 "move extents" ioctl did not
correctly check permissions. A local attacker could exploit this to
overwrite arbitrary files on the system, leading to root privilege
escalation. (CVE-2009-4131)