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CVE-2018-20784

Status Candidate

Overview

In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.

Related Files

Ubuntu Security Notice USN-4211-1
Posted Dec 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4211-1 - Zhipeng Xie discovered that an infinite loop could be triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service. Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did not properly validate SSID lengths. A physically proximate attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-20784, CVE-2019-17075, CVE-2019-17133
MD5 | c3d12483858f3736b29e481ef759a4b9
Ubuntu Security Notice USN-4211-2
Posted Dec 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4211-2 - USN-4211-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 ESM. Zhipeng Xie discovered that an infinite loop could be triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-20784, CVE-2019-17075, CVE-2019-17133
MD5 | fad8472da76f2823f7e48fc875f70f76
Ubuntu Security Notice USN-4115-2
Posted Sep 11, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4115-2 - USN 4115-1 fixed vulnerabilities in the Linux 4.15 kernel for Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. Unfortunately, as part of the update, a regression was introduced that caused a kernel crash when handling fragmented packets in some situations. This update addresses the issue. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-19985, CVE-2018-20784, CVE-2019-0136, CVE-2019-10207, CVE-2019-10638, CVE-2019-10639, CVE-2019-11487, CVE-2019-11599, CVE-2019-11810, CVE-2019-13631, CVE-2019-13648, CVE-2019-14283, CVE-2019-14284, CVE-2019-14763, CVE-2019-15090, CVE-2019-15211, CVE-2019-15212, CVE-2019-15214, CVE-2019-15215, CVE-2019-15216, CVE-2019-15218, CVE-2019-15220, CVE-2019-15221, CVE-2019-15292, CVE-2019-3701, CVE-2019-3819, CVE-2019-3900
MD5 | f3c403ca6993818b3a6b46a2dc892b23
Ubuntu Security Notice USN-4118-1
Posted Sep 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4118-1 - It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly track inode validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, overflow, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-13053, CVE-2018-13093, CVE-2018-13098, CVE-2018-13099, CVE-2018-13100, CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14614, CVE-2018-14616, CVE-2018-14617, CVE-2018-16862, CVE-2018-19985, CVE-2018-20169, CVE-2018-20511, CVE-2018-20784, CVE-2018-20856, CVE-2018-5383, CVE-2019-0136, CVE-2019-10126, CVE-2019-10207, CVE-2019-10638, CVE-2019-10639, CVE-2019-11085, CVE-2019-11487, CVE-2019-11599
MD5 | 606239d761ad7f615ccb6ead5cc82c96
Ubuntu Security Notice USN-4115-1
Posted Sep 2, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4115-1 - Hui Peng and Mathias Payer discovered that the Option USB High Speed driver in the Linux kernel did not properly validate metadata received from the device. A physically proximate attacker could use this to cause a denial of service. Zhipeng Xie discovered that an infinite loop could triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-19985, CVE-2018-20784, CVE-2019-0136, CVE-2019-10207, CVE-2019-10638, CVE-2019-10639, CVE-2019-11487, CVE-2019-11599, CVE-2019-11810, CVE-2019-13631, CVE-2019-13648, CVE-2019-14283, CVE-2019-14284, CVE-2019-14763, CVE-2019-15090, CVE-2019-15211, CVE-2019-15212, CVE-2019-15214, CVE-2019-15215, CVE-2019-15216, CVE-2019-15218, CVE-2019-15220, CVE-2019-15221, CVE-2019-15292, CVE-2019-3701, CVE-2019-3819, CVE-2019-3900
MD5 | d33b91a9062e22127c5fc65115ec33fe
Red Hat Security Advisory 2019-1971-01
Posted Jul 30, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-1971-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include denial of service, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-20784, CVE-2019-11085, CVE-2019-11810, CVE-2019-11811
MD5 | 190e6d1aa307389fbcc3428fefb73f47
Red Hat Security Advisory 2019-1959-01
Posted Jul 30, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-1959-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include denial of service, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-20784, CVE-2019-11085, CVE-2019-11810, CVE-2019-11811
MD5 | 5892cfe1d1be23803d0c8f3ec30049a6
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