Resource exhaustion in Linux Kernel
CVE-2019-19922
kernel/sched/fair.c in the Linux kernel before 5.3.9, when cpu.cfs_quota_us is used (e.g., with Kubernetes), allows attackers to cause a denial of service against non-cpu-bound applications by generating a workload that triggers unwanted slice expiration, aka CID-de53fd7aedb1. (In other words, although this slice expiration would typically be seen with benign workloads, it is possible that an attacker could calculate how many stray requests are required to force an entire Kubernetes cluster into a low-performance state caused by slice expiration, and ensure that a DDoS attack sent that number of stray requests. An attack does not affect the stability of the kernel; it only causes mismanagement of application execution.)
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (61.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Linux Kernel
- NetApp Active Iq Unified Manager
- NetApp Aff Baseboard Management Controller — versions a700
- NetApp Cloud Backup
- NetApp Data Availability Services
- NetApp E-Series Santricity OS Controller
- NetApp Fas\/aff Baseboard Management Controller
- NetApp Hci Baseboard Management Controller — versions h610s
- NetApp Solidfire Baseboard Management Controller
- NetApp Solidfire \& Hci Management Node
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/4226-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/01/msg00013.html (mailing-list, Mailing List, Third Party Advisory)
- www.oracle.com/security-alerts/cpuApr2021.html (Patch, Third Party Advisory)
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9 (Patch, Mailing List, Vendor Advisory)
- github.com/torvalds/linux/commit/de53fd7aedb100f03e5d2231cfce0e4993282425 (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- relistan.com/the-kernel-may-be-slowing-down-your-app (Exploit, Third Party Advisory)
- github.com/kubernetes/kubernetes/issues/67577 (Patch, Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20200204-0002/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-19922?
- CVE-2019-19922 is a medium-severity vulnerability in Linux Kernel, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2019-12-22.
- How severe is CVE-2019-19922?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2019-19922 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.