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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
SHA-256 | ac43373fd3992fe93ea49e70d60ced48d07ba9971e4ff45b9a5b27d1055fab57
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
SHA-256 | 4cc9d7156354ee94e31dfbd10c8fbfb9f55371614904959722ac400ac700368d
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
SHA-256 | 05acda341e120b77b16aad0ba3eb54346f60a3e3997eca4a108689927624648c
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
SHA-256 | 4f908bb81d9ebb9dd129fad885aa16a8ad89f97c5c09adc998aefff895ea8268
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
SHA-256 | 08121c3db54d152e12d06507d23ec168fbb76db1ad82346d206b3edabc68482d
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
SHA-256 | f934c9aa444715656db9b3ddb196d92357c891dd8a0ab53b282876a3eaf901c7
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
SHA-256 | 533442b850ec6435a2166f7b463b6ea0e759e9200d3c30aeb6b7c455e17f1f79
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