CVE-2018-20784
First published: Fri Dec 28 2018(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-80.7.1.rt9.153.el8_0 | 0:4.18.0-80.7.1.rt9.153.el8_0 |
| redhat/kernel | <0:4.18.0-80.7.1.el8_0 | 0:4.18.0-80.7.1.el8_0 |
| Linux Kernel | >=4.13<4.14.93 | |
| Linux Kernel | >=4.19<4.19.15 | |
| Linux Kernel | >=4.20<4.20.2 | |
| Linux Kernel | =5.0-rc1 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| Red Hat Enterprise Linux | =8.0 | |
| redhat enterprise Linux for real time | =8 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2018-20784 https://nvd.nist.gov/vuln/detail/CVE-2018-20784
- https://bugzilla.redhat.com/show_bug.cgi?id=1680540
- https://access.redhat.com/errata/RHSA-2019:1971
- https://access.redhat.com/errata/RHSA-2019:1959
- https://access.redhat.com/security/cve/cve-2018-20784
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2
- https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0
- https://usn.ubuntu.com/4115-1/
- https://usn.ubuntu.com/4118-1/
- https://usn.ubuntu.com/4211-1/
- https://usn.ubuntu.com/4211-2/
- https://launchpad.net/bugs/cve/CVE-2018-20784
- https://lore.kernel.org/lkml/1545879866-27809-1-git-send-email-xiexiuqi@huawei.com/T/#u
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1680544
- https://git.kernel.org/linus/c40f7d74c741a907cfaeb73a7697081881c497d0
- https://security-tracker.debian.org/tracker/CVE-2018-20784
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20784
- https://nvd.nist.gov/vuln/detail/CVE-2018-20784
- https://ubuntu.com/security/CVE-2018-20784
Frequently Asked Questions
What is the severity of CVE-2018-20784?
CVE-2018-20784 has a severity rating that can lead to denial of service due to infinite loops in certain Linux kernel scheduling mechanisms.
How do I fix CVE-2018-20784?
To fix CVE-2018-20784, update your Linux kernel to versions 4.20.2 or newer, or apply the appropriate patches as specified by your distribution.
Which Linux distributions are affected by CVE-2018-20784?
CVE-2018-20784 affects multiple Linux distributions including Red Hat Enterprise Linux, Ubuntu, and various versions of the Linux kernel.
Can CVE-2018-20784 be exploited remotely?
CVE-2018-20784 is exploitable locally, allowing attackers to induce high loads leading to a denial of service on the affected systems.
What versions of the Linux kernel are vulnerable to CVE-2018-20784?
Linux kernel versions prior to 4.20.2, specifically those between 4.13 and 4.19, as well as certain earlier kernel versions, are vulnerable to CVE-2018-20784.
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