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Fencer Vulns
medium 5.5

CVE-2007-6716 json

fs/direct-io.c in the dio subsystem in the Linux kernel before 2.6.23 does not properly zero out the dio struct, which allows local users t…

published 2008-09-04 18 y ago modified 2026-06-16 4 mo ago also EUVD-2007-6680

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

fs/direct-io.c in the dio subsystem in the Linux kernel before 2.6.23 does not properly zero out the dio struct, which allows local users to cause a denial of service (OOPS), as demonstrated by a certain fio test.

Patch / fix

  • linux linux_kernel 2.6.23
  • kernel RHEL 4 2.6.9-78.0.8.EL
  • kernel-smp RHEL 4 2.6.9-78.0.8.EL
  • kernel-xenU RHEL 4 2.6.9-78.0.8.EL
  • kernel-hugemem RHEL 4 2.6.9-78.0.8.EL
  • kernel-largesmp RHEL 4 2.6.9-78.0.8.EL
  • kernel RHEL 5 2.6.18-92.1.13.el5
  • kernel-PAE RHEL 5 2.6.18-92.1.13.el5
  • kernel-xen RHEL 5 2.6.18-92.1.13.el5

red hat advisories RHSA-2008:0972RHSA-2008:0885

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-2007-6716 updated

kernel: dio: zero struct dio with kzalloc instead of manually

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-92.1.13.el5, kernel-PAE 2.6.18-92.1.13.el5, kernel-xen 2.6.18-92.1.13.el5, kernel-kdump 2.6.18-92.1.13.el5, kernel-debuginfo-common 2.6.18-92.1.13.el5
    fixed: vendor fix RHSA-2008:0885
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-78.0.8.EL, kernel-smp 2.6.9-78.0.8.EL, kernel-xenU 2.6.9-78.0.8.EL, kernel-hugemem 2.6.9-78.0.8.EL, kernel-largesmp 2.6.9-78.0.8.EL
    fixed: vendor fix RHSA-2008:0972
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-92.1.13.el5, kernel-PAE 2.6.18-92.1.13.el5, kernel-xen 2.6.18-92.1.13.el5, kernel-kdump 2.6.18-92.1.13.el5, kernel-debuginfo-common 2.6.18-92.1.13.el5
    fixed: vendor fix RHSA-2008:0885
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-78.0.8.EL, kernel-smp 2.6.9-78.0.8.EL, kernel-xenU 2.6.9-78.0.8.EL, kernel-hugemem 2.6.9-78.0.8.EL, kernel-largesmp 2.6.9-78.0.8.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-78.0.8.EL, kernel-smp 2.6.9-78.0.8.EL, kernel-xenU 2.6.9-78.0.8.EL, kernel-hugemem 2.6.9-78.0.8.EL, kernel-largesmp 2.6.9-78.0.8.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-78.0.8.EL, kernel-smp 2.6.9-78.0.8.EL, kernel-xenU 2.6.9-78.0.8.EL, kernel-hugemem 2.6.9-78.0.8.EL, kernel-largesmp 2.6.9-78.0.8.EL
    fixed: vendor fix RHSA-2008:0972

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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • lkml.org http://lkml.org/lkml/2007/7/30/448 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

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.