Solución al Kernel de Linux anterior a 5.0.8 es vulnerable a la ejecución remota de código – Tecnovan
Solución al Kernel de Linux anterior a 5.0.8 es vulnerable a la ejecución remota de código
Entrada publicada el 20 | 05 | 2019

The MITRE CVE dictionary describes this issue as:

The rds_page_copy_user function in net/rds/page.c in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux kernel before 2.6.36 does not properly validate addresses obtained from user space, which allows local users to gain privileges via crafted use of the sendmsg and recvmsg system calls.

Find out more about CVE-2010-3904 from the MITRE CVE dictionary dictionary and NIST NVD.


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. Updates for Red Hat Enterprise Linux 5 and 6 are available to address this flaw.

CVSS v2 metrics

Base Score 7.2
Base Metrics AV:L/AC:L/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 5 (kernel) RHSA-2010:0792 2010-10-25
Red Hat Enterprise Linux 6 (kernel) RHSA-2010:0842 2010-11-10


Red Hat would like to thank Dan Rosenberg of Virtual Security Research 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 /etc/modprobe.d/blacklist file:

blacklist rds

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



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