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Fencer Intel
low 1.9

CVE-2012-6547 json

The __tun_chr_ioctl function in drivers/net/tun.c in the Linux kernel before 3.6 does not initialize a certain structure, which allows loca…

published 2013-03-14 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-6395

cvss
1.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

The __tun_chr_ioctl function in drivers/net/tun.c in the Linux kernel before 3.6 does not initialize a certain structure, which allows local users to obtain sensitive information from kernel stack memory via a crafted application.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 3.2.29-1

debian advisories DEBIAN-CVE-2012-6547

  • kernel RHEL 6 2.6.32-358.6.1.el6
  • perf RHEL 6 2.6.32-358.6.1.el6
  • python-perf RHEL 6 2.6.32-358.6.1.el6
  • kernel-kdump RHEL 6 2.6.32-358.6.1.el6
  • kernel-firmware RHEL 6 2.6.32-358.6.1.el6
  • kernel-bootwrapper RHEL 6 2.6.32-358.6.1.el6
  • kernel-debuginfo-common-i686 RHEL 6 2.6.32-358.6.1.el6
  • kernel-debuginfo-common-ppc64 RHEL 6 2.6.32-358.6.1.el6

red hat advisories RHSA-2013:0744RHSA-2013:0747

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-2012-6547 updated cvss 1.7

Kernel: net/tun: ioctl() based information leaks

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-348.4.1.el5, kernel-PAE 2.6.18-348.4.1.el5, kernel-xen 2.6.18-348.4.1.el5, kernel-kdump 2.6.18-348.4.1.el5, kernel-debuginfo-common 2.6.18-348.4.1.el5
    fixed: vendor fix RHSA-2013:0747
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux Desktop Optional (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux HPC Node Optional (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux Server Optional (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more Red Hat Enterprise Linux Workstation Optional (v. 6) perf 2.6.32-358.6.1.el6, kernel 2.6.32-358.6.1.el6, python-perf 2.6.32-358.6.1.el6, kernel-kdump 2.6.32-358.6.1.el6, kernel-firmware 2.6.32-358.6.1.el6, kernel-bootwrapper 2.6.32-358.6.1.el6, +4 more
    fixed: vendor fix RHSA-2013:0744
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
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.