CVSS v3
7
HIGH
EPSS Score
12.2%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
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.
Active exploitation of CVE-2018-18955 has not been confirmed. The EPSS score is 12.2%, indicating the estimated probability of exploitation in the next 30 days.
CVE-2018-18955 has a CVSS v3 base score of 7 (HIGH severity).
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Ranked by exploit probability (EPSS).