| Description: | fs/ext4/extents.c in the Linux kernel before 3.0 does not mark a modified extent as dirty in certain cases of extent splitting, which allows local users to cause a denial of service (system crash) via vectors involving ext4 umount and mount operations. Zheng Liu discovered a flaw in how the ext4 filesystem splits extents. A local unprivileged attacker could exploit this to crash the system, leading to a denial of service.
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