CVE-2018-20784
CRITICALCVSS 9.8/10EPSS 4.17%
Last modified
CVE-2018-20784 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 4.17% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 4.13, < 4.14.93 | — |
| Linux | Linux Kernel | >= 4.19, < 4.19.15 | — |
| Linux | Linux Kernel | >= 4.20, < 4.20.2 | — |
| Linux | Linux Kernel | 5.0 | Rc1 |
| Canonical | Ubuntu Linux | 14.04 | — |
| Canonical | Ubuntu Linux | 16.04 | — |
| Canonical | Ubuntu Linux | 18.04 | — |
| Redhat | Enterprise Linux | 8.0 | — |
| Redhat | Enterprise Linux For Real Time | 8 | — |
References
- https://access.redhat.com/errata/RHSA-2019:1959Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1971Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2Release Notes, Vendor Advisory
- https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0Patch, Third Party Advisory
- https://usn.ubuntu.com/4115-1/Third Party Advisory
- https://usn.ubuntu.com/4118-1/Third Party Advisory
- https://usn.ubuntu.com/4211-1/Third Party Advisory
- https://usn.ubuntu.com/4211-2/Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1959Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1971Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2Release Notes, Vendor Advisory
- https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0Patch, Third Party Advisory
- https://usn.ubuntu.com/4115-1/Third Party Advisory
- https://usn.ubuntu.com/4118-1/Third Party Advisory
- https://usn.ubuntu.com/4211-1/Third Party Advisory
- https://usn.ubuntu.com/4211-2/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-20784?
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.
How severe is CVE-2018-20784?
CVE-2018-20784 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.17% probability of exploitation in the next 30 days.
How do I fix CVE-2018-20784?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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