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Fencer Intel
high 7.8

CVE-2011-1093 json

The dccp_rcv_state_process function in net/dccp/input.c in the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kern…

published 2011-07-18 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1107

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The dccp_rcv_state_process function in net/dccp/input.c in the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kernel before 2.6.38 does not properly handle packets for a CLOSED endpoint, which allows remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending a DCCP-Close packet followed by a DCCP-Reset packet.

Patch / fix

  • linux linux_kernel 2.6.38
  • kernel RHEL 5 2.6.18-238.12.1.el5
  • kernel-PAE RHEL 5 2.6.18-238.12.1.el5
  • kernel-xen RHEL 5 2.6.18-238.12.1.el5
  • kernel-kdump RHEL 5 2.6.18-238.12.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-238.12.1.el5
  • kernel RHEL 6 2.6.32-71.29.1.el6
  • perf RHEL 6 2.6.32-71.29.1.el6
  • kernel-kdump RHEL 6 2.6.32-71.29.1.el6

red hat advisories RHSA-2011:0833RHSA-2011:0498RHSA-2011:0500

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-2011-1093 updated cvss 7.8

kernel: dccp: fix oops on Reset after close

  • Red Hat MRG Realtime for RHEL 5 Server perf 2.6.33.9-rt31.64.el5rt, kernel-rt 2.6.33.9-rt31.64.el5rt, kernel-rt-trace 2.6.33.9-rt31.64.el5rt, kernel-rt-vanilla 2.6.33.9-rt31.64.el5rt, kernel-rt-debuginfo-common 2.6.33.9-rt31.64.el5rt
    fixed: vendor fix RHSA-2011:0500
  • Red Hat Enterprise Linux (v. 5.6.z server) kernel 2.6.18-238.12.1.el5, kernel-PAE 2.6.18-238.12.1.el5, kernel-xen 2.6.18-238.12.1.el5, kernel-kdump 2.6.18-238.12.1.el5, kernel-debuginfo-common 2.6.18-238.12.1.el5
    fixed: vendor fix RHSA-2011:0833
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-71.29.1.el6, kernel 2.6.32-71.29.1.el6, kernel-firmware 2.6.32-71.29.1.el6, kernel-debuginfo-common-i686 2.6.32-71.29.1.el6, kernel-debuginfo-common-x86_64 2.6.32-71.29.1.el6 Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-71.29.1.el6, kernel 2.6.32-71.29.1.el6, kernel-firmware 2.6.32-71.29.1.el6, kernel-debuginfo-common-x86_64 2.6.32-71.29.1.el6 Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-71.29.1.el6, kernel 2.6.32-71.29.1.el6, kernel-kdump 2.6.32-71.29.1.el6, kernel-firmware 2.6.32-71.29.1.el6, kernel-bootwrapper 2.6.32-71.29.1.el6, kernel-debuginfo-common-i686 2.6.32-71.29.1.el6, +3 more Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-71.29.1.el6, kernel 2.6.32-71.29.1.el6, kernel-firmware 2.6.32-71.29.1.el6, kernel-debuginfo-common-i686 2.6.32-71.29.1.el6, kernel-debuginfo-common-x86_64 2.6.32-71.29.1.el6
    fixed: vendor fix RHSA-2011:0498
  • Red Hat Enterprise Linux (v. 5.6.z server) kernel-headers 2.6.18-238.12.1.el5 Red Hat Enterprise Linux Desktop (v. 6) kernel-headers 2.6.32-71.29.1.el6 Red Hat Enterprise Linux HPC Node (v. 6) kernel-headers 2.6.32-71.29.1.el6 Red Hat Enterprise Linux Server (v. 6) kernel-headers 2.6.32-71.29.1.el6 Red Hat Enterprise Linux Workstation (v. 6) kernel-headers 2.6.32-71.29.1.el6
    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

3.48% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
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.