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.
Key facts
- CVSS score
- 9.8 (v3.1)
- Severity
- CRITICAL
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
- CWE-835
- EPSS score
- 4.2% (91th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2018-13327)
- Published
- February 22, 2019
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2018-13327 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2024.
View on the EU Vulnerability DatabaseAffected products
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- linux / linux kernel
- linux / linux kernel
- redhat / enterprise linux
- redhat / enterprise linux for real time
Certified products that may be affected
23 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
- Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
- Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
- Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical
- Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat®, Inc. - FIPS 140 4458 - historical
See all 23 in the Security Certifications Explorer.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0(Patch, Vendor Advisory)
- https://access.redhat.com/errata/RHSA-2019:1959(Third Party Advisory)
- https://access.redhat.com/errata/RHSA-2019:1971(Third Party Advisory)
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2(Release Notes, Vendor Advisory)
- https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0(Patch, 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)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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