{"id":"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\nranges inside nested user namespaces in some situations. A local attacker\ncould use this to bypass access controls on resources outside the\nnamespace. (CVE-2018-18955)\n\nPhilipp Wendler discovered that the overlayfs implementation in the Linux\nkernel did not properly verify the directory contents permissions from\nwithin a unprivileged user namespace. A local attacker could use this to\nexpose sensitive information (protected file names). (CVE-2018-6559)\n","modified":"2026-04-22T09:52:58.692098Z","published":"2018-12-03T19:40:09Z","related":["UBUNTU-CVE-2018-18955","UBUNTU-CVE-2018-6559"],"upstream":["CVE-2018-18955","CVE-2018-6559","UBUNTU-CVE-2018-18955","UBUNTU-CVE-2018-6559"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3836-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6559"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-18955"}],"affected":[{"package":{"name":"linux","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/linux@4.15.0-42.45?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-42.45"}]}],"versions":["4.13.0-16.19","4.13.0-17.20","4.13.0-25.29","4.13.0-32.35","4.15.0-10.11","4.15.0-12.13","4.15.0-13.14","4.15.0-15.16","4.15.0-19.20","4.15.0-20.21","4.15.0-22.24","4.15.0-23.25","4.15.0-24.26","4.15.0-29.31","4.15.0-30.32","4.15.0-32.35","4.15.0-33.36","4.15.0-34.37","4.15.0-36.39","4.15.0-38.41","4.15.0-39.42"],"ecosystem_specific":{"availability":"No 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