UBUNTU-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.)
02 / AFFECTED SOFTWARE
Affected packages
16 explicit affected versions
1 explicit affected versions
12 explicit affected versions
16 explicit affected versions
33 explicit affected versions
12 explicit affected versions
17 explicit affected versions
47 explicit affected versions
23 explicit affected versions
24 explicit affected versions
14 explicit affected versions
40 explicit affected versions
60 explicit affected versions
51 explicit affected versions
35 explicit affected versions
34 explicit affected versions
39 explicit affected versions
1 explicit affected versions
9 explicit affected versions
1 explicit affected versions
1 explicit affected versions
6 explicit affected versions
33 explicit affected versions
9 explicit affected versions
2 explicit affected versions
27 explicit affected versions
20 explicit affected versions
23 explicit affected versions
26 explicit affected versions
4 explicit affected versions
2 explicit affected versions
12 explicit affected versions
1 explicit affected versions
37 explicit affected versions
11 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.)
05 / REFERENCES
Further evidence
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de53fd7aedb100f03e5d2231cfce0e4993282425
- https://git.kernel.org/linus/de53fd7aedb100f03e5d2231cfce0e4993282425
- https://github.com/kubernetes/kubernetes/issues/67577
- https://github.com/torvalds/linux/commit/de53fd7aedb100f03e5d2231cfce0e4993282425
- https://relistan.com/the-kernel-may-be-slowing-down-your-app
- https://ubuntu.com/security/CVE-2019-19922
- https://ubuntu.com/security/notices/USN-4226-1
- https://www.cve.org/CVERecord?id=CVE-2019-19922