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Ubuntu 18.04 LTS USN-4710-1: Critical Kernel Denial of Service

The system could be made to crash under certain conditions.. =========================================================================Ubuntu Security Notice USN-4710-1 January 28, 2021 linux vulnerability ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: The system could be made to crash under certain conditions. Software Description: - linux: Linux kernel Details: Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did not properly deallocate memory in some situations. A privileged attacker could use this to cause a denial of service (kernel memory exhaustion). Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-135-generic 4.15.0-135.139 linux-image-4.15.0-135-generic-lpae 4.15.0-135.139 linux-image-4.15.0-135-lowlatency 4.15.0-135.139 linux-image-generic 4.15.0.135.122 linux-image-generic-lpae 4.15.0.135.122 linux-image-lowlatency 4.15.0.135.122 linux-image-powerpc-e500mc 4.15.0.135.122 linux-image-powerpc-smp 4.15.0.135.122 linux-image-powerpc64-emb 4.15.0.135.122 linux-image-powerpc64-smp 4.15.0.135.122 linux-image-virtual 4.15.0.135.122 After a standard system update you need 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-4710-1 CVE-2020-25704 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-135.139 . Investigate the significant vulnerability in the Linux kernel impacting Ubuntu 18.04, which may lead to potential system failures due to memory-related problems.. Ubuntu Security Advisory, Linux Kernel Issue, Denial of Service Risk. . Severity: Critical. LinuxSecurity.com Team

Jan 28, 2021 •Critical Ubuntu