Public Date:
518034: CVE-2009-2698 kernel: udp socket NULL ptr dereference

The MITRE CVE dictionary describes this issue as:

The udp_sendmsg function in the UDP implementation in (1) net/ipv4/udp.c and (2) net/ipv6/udp.c in the Linux kernel before 2.6.19 allows local users to gain privileges or cause a denial of service (NULL pointer dereference and system crash) via vectors involving the MSG_MORE flag and a UDP socket.

Find out more about CVE-2009-2698 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise MRG. Updates for Red Hat Enterprise Linux 3, 4 and 5 to correct this issue are available:

CVSS v2 metrics

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

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 version 4 (kernel) RHSA-2009:1223 2009-08-24
Red Hat Enterprise Linux version 5 (kernel) RHSA-2009:1222 2009-08-24
Red Hat Enterprise Linux ES EUS (v. 4.7) (kernel) RHSA-2009:1469 2009-09-30
Red Hat Enterprise Linux EUS (v. 5.2 server) (kernel) RHSA-2009:1457 2009-09-22
Red Hat Enterprise Linux version 3 (kernel) RHSA-2009:1233 2009-08-27


Red Hat would like to thank Tavis Ormandy and Julien Tinnes of the Google Security Team for responsibly reporting this flaw.