The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and Red Hat
Enterprise MRG did not include support for the RDS Protocol, and therefore are
not affected by this issue. Future kernel updates in Red Hat Enterprise Linux 5
may address this flaw.
CVSS v2 metrics
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat Security Errata
|Red Hat Enterprise Linux 6 (kernel)||RHSA-2011:0007||2011-01-11|
|Red Hat Enterprise Linux 5 (kernel)||RHSA-2011:0004||2011-01-04|
AcknowledgementsRed Hat would like to thank Thomas Pollet for reporting this issue.
For users that do not run applications that use RDS, you can prevent the rds
module from being loaded by adding the following entry to the end of the
This way, the rds module cannot be loaded accidentally, which may occur if an
application that requires RDS is started. A reboot is not necessary for this
change to take effect but do make sure the module is not loaded in the first
place. You can verify that by running:
lsmod | grep rds
You may also consider removing the CAP_SYS_MODULE capability from the current
global capability set to prevent kernel modules from being loaded or unloaded.
The CAP_SYS_MODULE has a capability number of 16 (see linux/capability.h). The
default value has all the bits set. To remove this capability, you have to
clear the 16th bit of the default 32-bit value, e.g. 0xffffff ^ (1 << 16):
echo 0xFFFEFFFF > /proc/sys/kernel/cap-bound