Linux kernel vulnerabilities

2018-12-03T00:00:00
ID USN-3836-1
Type ubuntu
Reporter Ubuntu
Modified 2018-12-03T00:00:00

Description

Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. (CVE-2018-18955)

Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information (protected file names). (CVE-2018-6559)