Public Date:
651892: CVE-2010-4160 kernel: L2TP send buffer allocation size overflows

The MITRE CVE dictionary describes this issue as:

Multiple integer overflows in the (1) pppol2tp_sendmsg function in net/l2tp/l2tp_ppp.c, and the (2) l2tp_ip_sendmsg function in net/l2tp/l2tp_ip.c, in the PPPoL2TP and IPoL2TP implementations in the Linux kernel before allow local users to cause a denial of service (heap memory corruption and panic) or possibly gain privileges via a crafted sendto call.

Find out more about CVE-2010-4160 from the MITRE CVE dictionary dictionary and NIST NVD.


The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and 5 did not include L2TP functionality, and therefore are not affected by this issue. This has been addressed in Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG via and

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 6.9
Base Metrics AV:L/AC:M/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity Medium
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 version 6 (kernel) RHSA-2011:0007 2011-01-11
MRG Grid for RHEL 5 Server (kernel-rt) RHSA-2011:0330 2011-03-10


Red Hat would like to thank Dan Rosenberg for reporting this issue.