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Fencer Intel
high 7.5

CVE-2017-2634 json

It was found that the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation before 2.6.22.17 used the IPv4-only inet_sk…

published 2018-07-27 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-11795

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.2%
EPSS 5.2% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

It was found that the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation before 2.6.22.17 used the IPv4-only inet_sk_rebuild_header() function for both IPv4 and IPv6 DCCP connections, which could result in memory corruptions. A remote attacker could use this flaw to crash the system.

Patch / fix

  • linux linux_kernel 2.6.22.17
  • kernel RHEL 5 2.6.18-419.el5
  • kernel-PAE RHEL 5 2.6.18-419.el5
  • kernel-xen RHEL 5 2.6.18-419.el5
  • kernel-kdump RHEL 5 2.6.18-419.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-419.el5
  • kernel RHEL 5.9 AUS 2.6.18-348.33.1.el5
  • kernel-PAE RHEL 5.9 AUS 2.6.18-348.33.1.el5
  • kernel-xen RHEL 5.9 AUS 2.6.18-348.33.1.el5

red hat advisories RHSA-2017:0346RHSA-2017:0347RHSA-2017:0323

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-2017-2634 updated cvss 7.5

kernel: dccp: crash while sending ipv6 reset packet

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-419.el5, kernel-PAE 2.6.18-419.el5, kernel-xen 2.6.18-419.el5, kernel-kdump 2.6.18-419.el5, kernel-debuginfo-common 2.6.18-419.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-419.el5, kernel-PAE 2.6.18-419.el5, kernel-xen 2.6.18-419.el5, kernel-debuginfo-common 2.6.18-419.el5
    fixed: vendor fix RHSA-2017:0323
  • Red Hat Enterprise Linux Long Life (v. 5.6 server) kernel 2.6.18-238.58.1.el5, kernel-PAE 2.6.18-238.58.1.el5, kernel-xen 2.6.18-238.58.1.el5, kernel-debuginfo-common 2.6.18-238.58.1.el5
    fixed: vendor fix RHSA-2017:0347
  • Red Hat Enterprise Linux Long Life (v. 5.9 server) kernel 2.6.18-348.33.1.el5, kernel-PAE 2.6.18-348.33.1.el5, kernel-xen 2.6.18-348.33.1.el5, kernel-debuginfo-common 2.6.18-348.33.1.el5
    fixed: vendor fix RHSA-2017:0346
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, python-perf, kernel-kdump, kernel-tools, +3 more
    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

5.15% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/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

Affected products

  • Linux kernel:

Classification

Weakness
  • CWE-476 NULL Pointer Dereference
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
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.