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Fencer Vulns
medium 4.3

CVE-2007-3843 json

The Linux kernel before 2.6.23-rc1 checks the wrong global variable for the CIFS sec mount option, which might allow remote attackers to sp…

published 2007-08-09 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-3827

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

The Linux kernel before 2.6.23-rc1 checks the wrong global variable for the CIFS sec mount option, which might allow remote attackers to spoof CIFS network traffic that the client configured for security signatures, as demonstrated by lack of signing despite sec=ntlmv2i in a SetupAndX request.

Patch / fix

  • 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
  • kernel-hugemem RHEL 4 2.6.9-55.0.12.EL
  • kernel-largesmp RHEL 4 2.6.9-55.0.12.EL
  • kernel RHEL 5 2.6.18-8.1.10.el5
  • kernel-PAE RHEL 5 2.6.18-8.1.10.el5
  • kernel-xen RHEL 5 2.6.18-8.1.10.el5

red hat advisories RHSA-2007:0939RHSA-2007:0705

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-2007-3843 updated

CIFS signing sec= mount options don't work correctly

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-8.1.10.el5, kernel-PAE 2.6.18-8.1.10.el5, kernel-xen 2.6.18-8.1.10.el5, kernel-kdump 2.6.18-8.1.10.el5, kernel-debuginfo-common 2.6.18-8.1.10.el5
    fixed: vendor fix RHSA-2007:0705
  • 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 2.6.18-8.1.10.el5, kernel-PAE 2.6.18-8.1.10.el5, kernel-xen 2.6.18-8.1.10.el5, kernel-kdump 2.6.18-8.1.10.el5, kernel-debuginfo-common 2.6.18-8.1.10.el5
    fixed: vendor fix RHSA-2007:0705
  • 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

2.62% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

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.