USN-3836-1

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USN-3836-1

Summary: linux, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities

Details: 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)

References: https://ubuntu.com/security/notices/USN-3836-1, https://ubuntu.com/security/CVE-2018-6559, https://ubuntu.com/security/CVE-2018-18955