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CVE-2020-10781

Status Candidate

Overview

A flaw was found in the Linux Kernel before 5.8-rc6 in the ZRAM kernel module, where a user with a local account and the ability to read the /sys/class/zram-control/hot_add file can create ZRAM device nodes in the /dev/ directory. This read allocates kernel memory and is not accounted for a user that triggers the creation of that ZRAM device. With this vulnerability, continually reading the device may consume a large amount of system memory and cause the Out-of-Memory (OOM) killer to activate and terminate random userspace processes, possibly making the system inoperable.

Related Files

Ubuntu Security Notice USN-4485-1
Posted Sep 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4485-1 - Timothy Michaud discovered that the i915 graphics driver in the Linux kernel did not properly validate user memory locations for the i915_gem_execbuffer2_ioctl. A local attacker could possibly use this to cause a denial of service or execute arbitrary code. It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in certain situations. A local attacker could possibly use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-20669, CVE-2019-19947, CVE-2019-20810, CVE-2020-10732, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10781, CVE-2020-12655, CVE-2020-12656, CVE-2020-12771, CVE-2020-13974, CVE-2020-15393, CVE-2020-24394
SHA-256 | a61831f926ce25ea97d8bd2b2fe2ff6627483599c3f1ee6249023bd9550e4f67
Ubuntu Security Notice USN-4483-1
Posted Sep 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4483-1 - Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service. Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-20810, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10781, CVE-2020-12655, CVE-2020-12656, CVE-2020-12771, CVE-2020-13974, CVE-2020-14356, CVE-2020-15393, CVE-2020-24394
SHA-256 | f3d7b343dd037f207841d31eaef395a9ef8aa891f0b3d52ff6fe53d20c95c23f
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