Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2018-18955

In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.087
EPSS Ranking 92.2%
CVSS Severity
CVSS v3 Score 7.0
CVSS v2 Score 4.4
References
Products affected by CVE-2018-18955


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