The vulnerability of the map_write() function in “kernel/user_namespace.c” in the Linux operating system allows a hacker to gain access to confidential data, compromise its integrity, and cause service failures.

The vulnerability of the mapwrite function in “kernel/usernamespace.c” in the Linux operating system is related to improper authorization. Exploiting this vulnerability can allow an attacker to access confidential data, compromise its integrity, and cause service failures...

DEBIAN-CVE-2018-18955

In the Linux kernel 4.15.x through 4.19.x before 4.19.2, mapwrite in kernel/usernamespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAPSYSADMIN in an affected user namespace can bypass access controls on resources...

PT-2018-2302

Name of the Vulnerable Software and Affected Versions Linux kernel versions 4.15.x through 4.19.x before 4.19.2 Description The issue is related to the map write function in kernel/user namespace.c, which mishandles nested user namespaces with more than 5 UID or GID ranges. This allows a user wit...