CVE-2011-0699

A flaw was found in the BTRFS implementation in the Linux kernel, where a local user with elevated permissions (either root user or in the disk group) can issue an ioctl to the /dev/btrfs-control device node. This flaw panics the system and allows memory allocation if a specially crafted ioctl is made that abuses the logic when comparing values with different types.

Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, 6, or Red Hat Enterprise MRG as they did not backport the upstream commit bf5fc093c that introduced this issue.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

As the BTRFS module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:

echo "install btrfs /bin/true" >> /etc/modprobe.d/disable-btrfs.conf

The system will need to be restarted if the BTRFS modules are loaded, it may be possible to unload them. In most circumstances, the BTRFS kernel modules will be unable to be unloaded while any BTRFS filesystems are mounted or in use.

If the system requires this module to work correctly, this mitigation may not be suitable.

If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.