Skip to content
Fencer Intel
high 7.5

CVE-2011-1770 json

Integer underflow in the dccp_parse_options function (net/dccp/options.c) in the Linux kernel before 2.6.33.14 allows remote attackers to c…

published 2011-06-24 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1769

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Integer underflow in the dccp_parse_options function (net/dccp/options.c) in the Linux kernel before 2.6.33.14 allows remote attackers to cause a denial of service via a Datagram Congestion Control Protocol (DCCP) packet with an invalid feature options length, which triggers a buffer over-read.

Patch / fix

  • linux linux_kernel 2.6.33.14
  • kernel RHEL 6 2.6.32-131.2.1.el6
  • perf RHEL 6 2.6.32-131.2.1.el6
  • kernel-kdump RHEL 6 2.6.32-131.2.1.el6
  • kernel-firmware RHEL 6 2.6.32-131.2.1.el6
  • kernel-bootwrapper RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-i686 RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-ppc64 RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-s390x RHEL 6 2.6.32-131.2.1.el6

red hat advisories RHSA-2011:0836RHSA-2011:1253

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-2011-1770 updated cvss 7.8

kernel: dccp: handle invalid feature options length

  • Red Hat Enterprise MRG 1 kernel-rt
    affected: no fix available
  • Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-131.2.1.el6, kernel 2.6.32-131.2.1.el6, kernel-kdump 2.6.32-131.2.1.el6, kernel-firmware 2.6.32-131.2.1.el6, kernel-bootwrapper 2.6.32-131.2.1.el6, kernel-debuginfo-common-i686 2.6.32-131.2.1.el6, +3 more
    fixed: vendor fix RHSA-2011:0836
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 2.6.33.9-rt31.75.el6rt, kernel-rt-trace 2.6.33.9-rt31.75.el6rt, kernel-rt-vanilla 2.6.33.9-rt31.75.el6rt, kernel-rt-firmware 2.6.33.9-rt31.75.el6rt, kernel-rt-debuginfo-common-x86_64 2.6.33.9-rt31.75.el6rt
    fixed: vendor fix RHSA-2011:1253
  • Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 5 kernel
    not affected: vulnerable code not present

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

Exploit prediction

4.36% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)
Technology feeds

References

Sources

Fencer Intel 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.