The create_user_ns function in kernel/user_namespace.c in the Linux kernel before 3.8.6 does not check whether a chroot directory exists that differs from the namespace root directory, which allows local users to bypass intended filesystem restrictions via a crafted clone system call
Published Apr 24, 2013
2.1
LOWCVSS 2.0
EPSS 0.38%
Description
The create_user_ns function in kernel/user_namespace.c in the Linux kernel before 3.8.6 does not check whether a chroot directory exists that differs from the namespace root directory, which allows local users to bypass intended filesystem restrictions via a crafted clone system call.
Affected products
No data.
- ≤ 3.8.5
- 3.8.0
- 3.8.1
- 3.8.2
- 3.8.3
- 3.8.4
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
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:L/Au:N/C:N/I:P/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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.38% (0.00383) | 29.95th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.38% (0.00383) | 29.90th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00039) | 8.91th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.95% (0.00950) | 30.63th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
References (7)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d x_refsource_CONFIRM
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2013/04/16/11 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2013-1956 Vendor Advisory
- https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2013-1956
- https://www.cve.org/CVERecord?id=CVE-2013-1956
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d | x_refsource_CONFIRM | |
| http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6 | x_refsource_CONFIRM | |
| http://www.openwall.com/lists/oss-security/2013/04/16/11 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2013-1956 | Vendor Advisory | |
| https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-1956 | ||
| https://www.cve.org/CVERecord?id=CVE-2013-1956 |
Change history (0)
No recorded changes yet.