Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) or gain escalated privileges.
1) A vulnerability is caused due to insufficient access checks when processing the "EXT4_IOC_MOVE_EXT" IOCTL, which can be exploited to overwrite files with root privileges by sending a specially crafted IOCTL.
2) An error within the "ext4_fill_flex_info()" function in fs/ext4/super.c can be exploited to cause a division by zero by mounting a specially crafted filesystem.
3) An error within the "ext4_decode_error()" function in fs/ext4/super.c can be exploited to cause a NULL pointer dereference by mounting a specially crafted filesystem.
Solution: Update to version 188.8.131.52 and 184.108.40.206.
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Subject: Linux Kernel Ext4 Multiple Vulnerabilities
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