USN-3835-1: Linux kernel vulnerabilities<\/p>\n
A security issue affects these releases of Ubuntu and its derivatives:<\/p>\n
Several security issues were fixed in the Linux kernel.<\/p>\n
Jann Horn discovered that the procfs file system implementation in the
\nLinux kernel did not properly restrict the ability to inspect the kernel
\nstack of an arbitrary task. A local attacker could use this to expose
\nsensitive information. (CVE-2018-17972)<\/p>\n
Jann Horn discovered that the mremap() system call in the Linux kernel did
\nnot properly flush the TLB when completing, potentially leaving access to a
\nphysical page after it has been released to the page allocator. A local
\nattacker could use this to cause a denial of service (system crash), expose
\nsensitive information, or possibly execute arbitrary code. (CVE-2018-18281)<\/p>\n
It was discovered that the BPF verifier in the Linux kernel did not
\ncorrectly compute numeric bounds in some situations. A local attacker could
\nuse this to cause a denial of service (system crash) or possibly execute
\narbitrary code. (CVE-2018-18445)<\/p>\n
Daniel Dadap discovered that the module loading implementation in the Linux
\nkernel did not properly enforce signed module loading when booted with UEFI
\nSecure Boot in some situations. A local privileged attacker could use this
\nto execute untrusted code in the kernel. (CVE-2018-18653)<\/p>\n
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)<\/p>\n
Philipp 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)<\/p>\n
The problem can be corrected by updating your system to the following package versions:<\/p>\n
To update your system, please follow these instructions: https:\/\/wiki.ubuntu.com\/Security\/Upgrades<\/a>.<\/p>\n After a standard system update you need to reboot your computer to make ATTENTION: Due to an unavoidable ABI change the kernel updates have Source: USN-3835-1: Linux kernel vulnerabilities<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" USN-3835-1: Linux kernel vulnerabilities linux, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 18.10 Summary Several security issues were fixed in the Linux kernel. Software Description linux – Linux kernel linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems linux-kvm – Linux kernel for cloud environments linux-raspi2 – Linux kernel for Raspberry Pi 2 Details Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. (CVE-2018-17972) Jann Horn discovered that the mremap() system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A [ more… ]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[586],"tags":[587],"class_list":["post-27942","post","type-post","status-publish","format-standard","hentry","category-ubuntu-usn","tag-ubuntu-usn"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/27942","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/comments?post=27942"}],"version-history":[{"count":1,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/27942\/revisions"}],"predecessor-version":[{"id":27943,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/27942\/revisions\/27943"}],"wp:attachment":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/media?parent=27942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/categories?post=27942"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/tags?post=27942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nall the necessary changes.<\/p>\n
\nbeen given a new version number, which requires you to recompile and
\nreinstall all third party kernel modules you might have installed.
\nUnless you manually uninstalled the standard kernel metapackages
\n(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
\nlinux-powerpc), a standard system upgrade will automatically perform
\nthis as well.<\/p>\nReferences<\/h2>\n
\n