CVE-2019-19922 — kernel/sched/fair

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. (I

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-12-22T19:07:16.000Z
• Last modified: 2024-08-05T02:32:10.074Z

09References

• usn.ubuntu.com — https://usn.ubuntu.com/4226-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/01/msg00013.html
• www.oracle.com — https://www.oracle.com/security-alerts/cpuApr2021.html
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9
• github.com — https://github.com/torvalds/linux/commit/de53fd7aedb100f03e5d2231cfce0e499328242…
• git.kernel.org — https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de53f…
• relistan.com — https://relistan.com/the-kernel-may-be-slowing-down-your-app
• github.com — https://github.com/kubernetes/kubernetes/issues/67577
• security.netapp.com — https://security.netapp.com/advisory/ntap-20200204-0002/