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Fencer Vulns
high 7.1

CVE-2009-3939 json

The poll_mode_io file for the megaraid_sas driver in the Linux kernel 2.6.31.6 and earlier has world-writable permissions, which allows loc…

published 2009-11-16 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3910

cvss
7.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

The poll_mode_io file for the megaraid_sas driver in the Linux kernel 2.6.31.6 and earlier has world-writable permissions, which allows local users to change the I/O mode of the driver by modifying this file.

Patch / fix

  • kernel RHEL 4 2.6.9-89.0.20.EL
  • kernel-smp RHEL 4 2.6.9-89.0.20.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.20.EL
  • kernel-hugemem RHEL 4 2.6.9-89.0.20.EL
  • kernel-largesmp RHEL 4 2.6.9-89.0.20.EL
  • kernel RHEL 5 2.6.18-164.11.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.11.1.el5
  • kernel-xen RHEL 5 2.6.18-164.11.1.el5

red hat advisories RHSA-2010:0076RHSA-2010:0046RHSA-2009:1635

  • kernel-source openSUSE Tumbleweed 4.8.13-1.1

opensuse advisories openSUSE-SU-2024:10128-1

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-2009-3939 updated cvss 3.6

kernel: megaraid_sas permissions in sysfs

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-139.el5rt, kernel-rt-trace 2.6.24.7-139.el5rt, kernel-rt-vanilla 2.6.24.7-139.el5rt, kernel-rt-debuginfo-common 2.6.24.7-139.el5rt
    fixed: vendor fix RHSA-2009:1635
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL
    fixed: vendor fix RHSA-2010:0076
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL
    fixed: vendor fix RHSA-2010:0076

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

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=526068 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD 2.0 6.6 AV:L/AC:L/Au:N/C:N/I:C/A:C

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource
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.