A security issue and some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to manipulate certain data and cause a DoS (Denial of Service), and by malicious people to potentially compromise a vulnerable system.
1) The security issue is caused due to insecure permissions being set to driver attributes in sysfs ("/sys/bus/pci/drivers/megaraid_sas/poll_mode_io") and can be exploited to manipulate driver behaviour.
2) A locking error within the TTY subsystem can be exploited to cause a NULL pointer dereference.
3) A boundary error within the "hfs_bnode_read()" function in fs/hfs/bnode.c can be exploited to cause a buffer overflow by e.g. tricking a user into mounting and accessing a specially crafted HFS file system.
4) A vulnerability is caused due to an unspecified error when handling the EXT4_IOC_MOVE_EXT IOCTL. This can be exploited to e.g. cause a file system corruption by sending a specially crafted IOCTL.
Solution: Update to version 2.6.33, which fixes vulnerabilities #1, #2, and #3.
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Subject: Linux Kernel Multiple Vulnerabilities
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