Skip to content
Fencer Vulns
high 7.8

CVE-2009-2698 json

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 lo…

published 2009-08-27 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2690

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.1%
EPSS 7.1% chance of exploitation in 30 days, percentile 94%
public exploits
3
Exploit-DB

Summary

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.

Patch / fix

  • linux linux_kernel 2.6.19
  • kernel RHEL 3 2.4.21-60.EL
  • kernel-smp RHEL 3 2.4.21-60.EL
  • kernel-BOOT RHEL 3 2.4.21-60.EL
  • kernel-source RHEL 3 2.4.21-60.EL
  • kernel-hugemem RHEL 3 2.4.21-60.EL
  • kernel-unsupported RHEL 3 2.4.21-60.EL
  • kernel-smp-unsupported RHEL 3 2.4.21-60.EL
  • kernel-hugemem-unsupported RHEL 3 2.4.21-60.EL

red hat advisories RHSA-2009:1469RHSA-2009:1457RHSA-2009:1233RHSA-2009:1223RHSA-2009:1222

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-2698 updated cvss 7.2

kernel: udp socket NULL ptr dereference

  • Red Hat Desktop version 3 kernel 2.4.21-60.EL, kernel-smp 2.4.21-60.EL, kernel-BOOT 2.4.21-60.EL, kernel-source 2.4.21-60.EL, kernel-hugemem 2.4.21-60.EL, kernel-unsupported 2.4.21-60.EL, +2 more
    fixed: vendor fix RHSA-2009:1233
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-128.7.1.el5, kernel-PAE 2.6.18-128.7.1.el5, kernel-xen 2.6.18-128.7.1.el5, kernel-kdump 2.6.18-128.7.1.el5, kernel-debuginfo-common 2.6.18-128.7.1.el5
    fixed: vendor fix RHSA-2009:1222
  • Red Hat Enterprise Linux AS EUS (v. 4.7) kernel 2.6.9-78.0.27.EL, kernel-smp 2.6.9-78.0.27.EL, kernel-xenU 2.6.9-78.0.27.EL, kernel-hugemem 2.6.9-78.0.27.EL, kernel-largesmp 2.6.9-78.0.27.EL
    fixed: vendor fix RHSA-2009:1469
  • Red Hat Enterprise Linux AS version 3 kernel 2.4.21-60.EL, kernel-smp 2.4.21-60.EL, kernel-BOOT 2.4.21-60.EL, kernel-source 2.4.21-60.EL, kernel-hugemem 2.4.21-60.EL, kernel-unsupported 2.4.21-60.EL, +2 more
    fixed: vendor fix RHSA-2009:1233
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.9.EL, kernel-smp 2.6.9-89.0.9.EL, kernel-xenU 2.6.9-89.0.9.EL, kernel-hugemem 2.6.9-89.0.9.EL, kernel-largesmp 2.6.9-89.0.9.EL
    fixed: vendor fix RHSA-2009:1223
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-128.7.1.el5, kernel-PAE 2.6.18-128.7.1.el5, kernel-xen 2.6.18-128.7.1.el5, kernel-kdump 2.6.18-128.7.1.el5, kernel-debuginfo-common 2.6.18-128.7.1.el5
    fixed: vendor fix RHSA-2009:1222
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.9.EL, kernel-smp 2.6.9-89.0.9.EL, kernel-xenU 2.6.9-89.0.9.EL, kernel-hugemem 2.6.9-89.0.9.EL, kernel-largesmp 2.6.9-89.0.9.EL
    fixed: vendor fix RHSA-2009:1223
  • Red Hat Enterprise Linux ES EUS (v. 4.7) kernel 2.6.9-78.0.27.EL, kernel-smp 2.6.9-78.0.27.EL, kernel-xenU 2.6.9-78.0.27.EL, kernel-hugemem 2.6.9-78.0.27.EL, kernel-largesmp 2.6.9-78.0.27.EL
    fixed: vendor fix RHSA-2009:1469
show 5 more
  • Red Hat Enterprise Linux ES version 3 kernel 2.4.21-60.EL, kernel-smp 2.4.21-60.EL, kernel-BOOT 2.4.21-60.EL, kernel-source 2.4.21-60.EL, kernel-hugemem 2.4.21-60.EL, kernel-unsupported 2.4.21-60.EL, +2 more
    fixed: vendor fix RHSA-2009:1233
  • Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.9.EL, kernel-smp 2.6.9-89.0.9.EL, kernel-xenU 2.6.9-89.0.9.EL, kernel-hugemem 2.6.9-89.0.9.EL, kernel-largesmp 2.6.9-89.0.9.EL
    fixed: vendor fix RHSA-2009:1223
  • Red Hat Enterprise Linux EUS (v. 5.2 server) kernel 2.6.18-92.1.28.el5, kernel-PAE 2.6.18-92.1.28.el5, kernel-xen 2.6.18-92.1.28.el5, kernel-kdump 2.6.18-92.1.28.el5, kernel-debuginfo-common 2.6.18-92.1.28.el5
    fixed: vendor fix RHSA-2009:1457
  • Red Hat Enterprise Linux WS version 3 kernel 2.4.21-60.EL, kernel-smp 2.4.21-60.EL, kernel-BOOT 2.4.21-60.EL, kernel-source 2.4.21-60.EL, kernel-hugemem 2.4.21-60.EL, kernel-unsupported 2.4.21-60.EL, +2 more
    fixed: vendor fix RHSA-2009:1233
  • Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.9.EL, kernel-smp 2.6.9-89.0.9.EL, kernel-xenU 2.6.9-89.0.9.EL, kernel-hugemem 2.6.9-89.0.9.EL, kernel-largesmp 2.6.9-89.0.9.EL
    fixed: vendor fix RHSA-2009:1223

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-9542)

Exploit prediction

7.12% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-9575 Linux Kernel < 2.6.19 (Debian 4) - 'udp_sendmsg' Local Privilege Escalation (3) local, 2009-09-02
  • EDB-9574 Linux Kernel < 2.6.19 (x86/x64) - 'udp_sendmsg' Local Privilege Escalation (2) local, 2009-09-02
  • EDB-9542 Linux Kernel 2.6 < 2.6.19 (White Box 4 / CentOS 4.4/4.5 / Fedora Core 4/5/6 x86) - 'ip_append_data()' Ring0 Privilege Escalation (1) local, 2009-08-31
  • securityfocus.com http://www.securityfocus.com/bid/36108 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.