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Fencer Vulns
low 2.1

CVE-2006-6921 json

Unspecified versions of the Linux kernel allow local users to cause a denial of service (unrecoverable zombie process) via a program with c…

published 2007-01-12 19 y ago modified 2026-06-16 4 mo ago also EUVD-2006-6904

cvss
2.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

Unspecified versions of the Linux kernel allow local users to cause a denial of service (unrecoverable zombie process) via a program with certain instructions that prevent init from properly reaping a child whose parent has died.

Patch / fix

  • kernel RHEL 5 2.6.18-53.1.14.el5
  • kernel-PAE RHEL 5 2.6.18-53.1.14.el5
  • kernel-xen RHEL 5 2.6.18-53.1.14.el5
  • kernel-kdump RHEL 5 2.6.18-53.1.14.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-53.1.14.el5
  • kernel RHEL 4 2.6.9-55.0.12.EL
  • kernel-smp RHEL 4 2.6.9-55.0.12.EL
  • kernel-xenU RHEL 4 2.6.9-55.0.12.EL

red hat advisories RHSA-2008:0154RHSA-2007:0939

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-2006-6921 updated

kernel: denial of service with wedged processes

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-53.1.14.el5, kernel-PAE 2.6.18-53.1.14.el5, kernel-xen 2.6.18-53.1.14.el5, kernel-kdump 2.6.18-53.1.14.el5, kernel-debuginfo-common 2.6.18-53.1.14.el5
    fixed: vendor fix RHSA-2008:0154
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-55.0.12.EL, kernel-smp 2.6.9-55.0.12.EL, kernel-xenU 2.6.9-55.0.12.EL, kernel-hugemem 2.6.9-55.0.12.EL, kernel-largesmp 2.6.9-55.0.12.EL
    fixed: vendor fix RHSA-2007:0939
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-53.1.14.el5, kernel-PAE 2.6.18-53.1.14.el5, kernel-xen 2.6.18-53.1.14.el5, kernel-kdump 2.6.18-53.1.14.el5, kernel-debuginfo-common 2.6.18-53.1.14.el5
    fixed: vendor fix RHSA-2008:0154
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-55.0.12.EL, kernel-smp 2.6.9-55.0.12.EL, kernel-xenU 2.6.9-55.0.12.EL, kernel-hugemem 2.6.9-55.0.12.EL, kernel-largesmp 2.6.9-55.0.12.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-55.0.12.EL, kernel-smp 2.6.9-55.0.12.EL, kernel-xenU 2.6.9-55.0.12.EL, kernel-hugemem 2.6.9-55.0.12.EL, kernel-largesmp 2.6.9-55.0.12.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-55.0.12.EL, kernel-smp 2.6.9-55.0.12.EL, kernel-xenU 2.6.9-55.0.12.EL, kernel-hugemem 2.6.9-55.0.12.EL, kernel-largesmp 2.6.9-55.0.12.EL
    fixed: vendor fix RHSA-2007:0939

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

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • uwsg.iu.edu http://uwsg.iu.edu/hypermail/linux/kernel/0612.2/0980.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

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.