| Description: | The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal. A flaw was found in the Linux's kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service.
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