Kernel: net/tun: ioctl() based information leaks
Published Mar 14, 2013
1.9
LOWCVSS 2.0
EPSS 0.40%
Description
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.
Affected products
No data.
- ≤ 3.5.7
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0.1
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
- 3.0.6
- 3.0.7
- 3.0.8
- 3.0.9
- 3.0.10
- 3.0.11
- 3.0.12
- 3.0.13
- 3.0.14
- 3.0.15
- 3.0.16
- 3.0.17
- 3.0.18
- 3.0.19
- 3.0.20
- 3.0.21
- 3.0.22
- 3.0.23
- 3.0.24
- 3.0.25
- 3.0.26
- 3.0.27
- 3.0.28
- 3.0.29
- 3.0.30
- 3.0.31
- 3.0.32
- 3.0.33
- 3.0.34
- 3.0.35
- 3.0.36
- 3.0.37
- 3.0.38
- 3.0.39
- 3.0.40
- 3.0.41
- 3.0.42
- 3.0.43
- 3.0.44
- 3.0.45
- 3.0.46
- 3.0.47
- 3.0.48
- 3.0.49
- 3.0.50
- 3.0.51
- 3.0.52
- 3.0.53
- 3.0.54
- 3.0.55
- 3.0.56
- 3.0.57
- 3.0.58
- 3.0.59
- 3.0.60
- 3.0.61
- 3.0.62
- 3.0.63
- 3.0.64
- 3.0.65
- 3.0.66
- 3.0.67
- 3.0.68
- 3.1
- 3.1
- 3.1
- 3.1
- 3.1
- 3.1.1
- 3.1.2
- 3.1.3
- 3.1.4
- 3.1.5
- 3.1.6
- 3.1.7
- 3.1.8
- 3.1.9
- 3.1.10
- 3.2
- 3.2
- 3.2
- 3.2
- 3.2
- 3.2
- 3.2
- 3.2.1
- 3.2.2
- 3.2.3
- 3.2.4
- 3.2.5
- 3.2.6
- 3.2.7
- 3.2.8
- 3.2.9
- 3.2.10
- 3.2.11
- 3.2.12
- 3.2.13
- 3.2.14
- 3.2.15
- 3.2.16
- 3.2.17
- 3.2.18
- 3.2.19
- 3.2.20
- 3.2.21
- 3.2.22
- 3.2.23
- 3.2.24
- 3.2.25
- 3.2.26
- 3.2.27
- 3.2.28
- 3.2.29
- 3.2.30
- 3.3
- 3.3
- 3.3
- 3.3
- 3.3
- 3.3
- 3.3
- 3.3
- 3.3.1
- 3.3.2
- 3.3.3
- 3.3.4
- 3.3.5
- 3.3.6
- 3.3.7
- 3.3.8
- 3.4
- 3.4
- 3.4
- 3.4
- 3.4
- 3.4
- 3.4
- 3.4
- 3.4.1
- 3.4.2
- 3.4.3
- 3.4.4
- 3.4.5
- 3.4.6
- 3.4.7
- 3.4.8
- 3.4.9
- 3.4.10
- 3.4.11
- 3.4.12
- 3.4.13
- 3.4.14
- 3.4.15
- 3.4.16
- 3.4.17
- 3.4.18
- 3.4.19
- 3.4.20
- 3.4.21
- 3.4.22
- 3.4.23
- 3.4.24
- 3.4.25
- 3.4.26
- 3.4.27
- 3.4.28
- 3.4.29
- 3.4.30
- 3.4.31
- 3.4.32
- 3.5.1
- 3.5.2
- 3.5.3
- 3.5.4
- 3.5.5
- 3.5.6
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-348.4.1.el5
Fixed · RHSA-2013:0747
Red Hat Enterprise Linux 6
kernel-0:2.6.32-358.6.1.el6
Fixed · RHSA-2013:0744
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-348.4.1.el5 | Fixed | RHSA-2013:0747 |
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-358.6.1.el6 | Fixed | RHSA-2013:0744 |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise MRG 2. This issue did affect the version of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.40% (0.00399) | 31.74th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.40% (0.00399) | 31.50th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.02% (0.00020) | 3.01th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.08% (0.00082) | 36.88th | v3 (v2023.03.01) |
| Jun 22, 2024 | 0.08% (0.00082) | 35.37th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.08% (0.00082) | 33.36th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
References (10)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc x_refsource_CONFIRM
- http://rhn.redhat.com/errata/RHSA-2013-0744.html vendor-advisoryx_refsource_REDHAT
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:176 vendor-advisoryx_refsource_MANDRIVA
- http://www.openwall.com/lists/oss-security/2013/03/05/13 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2012-6547 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=922344 Issue Tracking
- https://github.com/torvalds/linux/commit/a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2012-6547
- https://www.cve.org/CVERecord?id=CVE-2012-6547
- https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.6.bz2 x_refsource_CONFIRMPatch
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc | x_refsource_CONFIRM | |
| http://rhn.redhat.com/errata/RHSA-2013-0744.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2013:176 | vendor-advisoryx_refsource_MANDRIVA | |
| http://www.openwall.com/lists/oss-security/2013/03/05/13 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2012-6547 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=922344 | Issue Tracking | |
| https://github.com/torvalds/linux/commit/a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2012-6547 | ||
| https://www.cve.org/CVERecord?id=CVE-2012-6547 | ||
| https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.6.bz2 | x_refsource_CONFIRMPatch |
Change history (0)
No recorded changes yet.