CVE-2013-1956

Severity: low (CVSS 2.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-04-24 · updated 2026-06-16
Weakness: CWE-264

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

Linux kernel: through 3.8.5; 3.8.0, 3.8.1, 3.8.2, 3.8.3, 3.8.4

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6
http://www.openwall.com/lists/oss-security/2013/04/16/11
https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3151527ee007b73a0ebd296010f1c0454a919c7d
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6
http://www.openwall.com/lists/oss-security/2013/04/16/11
https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d

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