What’s Vulnerable › Vulnerabilities

CVE-2013-1858

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2013-04-05 · updated 2026-06-16
• Weakness: CWE-264

Description

The clone system-call implementation in the Linux kernel before 3.8.3 does not properly handle a combination of the CLONE_NEWUSER and CLONE_FS flags, which allows local users to gain privileges by calling chroot and leveraging the sharing of the / directory between a parent process and a child process.

Affected products

• Linux kernel: through 3.8.2; 3.0-rc1, 3.0-rc2, 3.0-rc3, 3.0-rc4, 3.0-rc5, 3.0-rc6 (+209)

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=e66eded8309ebf679d3d3c1f5820d1f2ca332c71
• http://stealth.openwall.net/xSports/clown-newuser.c
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.3
• http://www.openwall.com/lists/oss-security/2013/03/14/6
• https://bugzilla.redhat.com/show_bug.cgi?id=921448
• https://github.com/torvalds/linux/commit/e66eded8309ebf679d3d3c1f5820d1f2ca332c71
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=e66eded8309ebf679d3d3c1f5820d1f2ca332c71
• http://stealth.openwall.net/xSports/clown-newuser.c
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.3
• http://www.openwall.com/lists/oss-security/2013/03/14/6
• https://bugzilla.redhat.com/show_bug.cgi?id=921448
• https://github.com/torvalds/linux/commit/e66eded8309ebf679d3d3c1f5820d1f2ca332c71

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