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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 . =========================================================================Ubuntu Security Notice USN-. security, linux, kernel, ============================================. . Severity: Critical. LinuxSecurity.com Team

Jan 27, 2020 •Critical Ubuntu