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Ubuntu 18.04 LTS: USN-4255-1 Critical: Linux Kernel Issues

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-4255-1 January 28, 2020 linux, linux-aws, linux-oem vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-oem: Linux kernel for OEM processors Details: It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615) It was discovered that a race condition can lead to a use-after-free while destroying GEM contexts in the i915 driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-7053) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1058-aws 4.15.0-1058.60 linux-image-4.15.0-1067-oem 4.15.0-1067.77 linux-image-4.15.0-76-generic 4.15.0-76.86 linux-image-4.15.0-76-generic-lpae 4.15.0-76.86 linux-image-4.15.0-76-lowlatency 4.15.0-76.86 linux-image-aws 4.15.0.1058.59 linux-image-aws-lts-18.04 4.15.0.1058.59 linux-image-generic 4.15.0.76.78 linux-image-generic-lpae 4.15.0.76.78 linux-image-lowlatency 4.15.0.76.78 linux-image-oem 4.15.0.1067.71 linux-image-powerpc-e500mc 4.15.0.76.78 linux-image-powerpc-smp 4.15.0.76.78 linux-image-powerpc64-emb 4.15.0.76.78 linux-image-powerpc64-smp 4.15.0.76.78 linux-image-virtual 4.15.0.76.78 After a standard system update youneed to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-4255-1 CVE-2019-14615, CVE-2020-7053 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-76.86 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1058.60 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1067.77 . Multiple security vulnerabilities in the Linux kernel addressed in Ubuntu 20.04 LTS. Users advised to upgrade for improved protection.. Ubuntu Kernel Security, Linux Kernel Issues, AWS Linux Security, OEM Linux Kernel. . Severity: Critical. LinuxSecurity.com Team

Jan 27, 2020 •Critical Ubuntu