It appears to me that SERVER-121912 and SERVER-125742 haven't rolled out correctly.

 

> uname -a
Linux <redacted> 7.0.0-38-generic #38-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep  4 09:10:14 UTC 2026 x86_64 GNU/Linux

> lsb_release -d
Description:    Ubuntu 26.04.1 LTS

> docker -v
Docker version 29.8.2, build 7fc2dff

> docker run mongo:8

{"t":\{"$date":"2026-10-04T19:15:33.043+00:00"}

,"s":"F",  "c":"CONTROL",  "id":12257600,"ctx":"main","msg":"MongoDB cannot start: Linux kernel versions 6.19 and newer has a known incompatibility with this version of MongoDB. See https://jira.mongodb.org/browse/SERVER-121912 for more information."}

> docker run mongo:9

{"t":\{"$date":"2026-10-04T19:15:35.158+00:00"}

,"s":"F",  "c":"CONTROL",  "id":12257600,"ctx":"main","msg":"MongoDB cannot start: Linux kernel versions 6.19 and newer has a known incompatibility with this version of MongoDB. See https://jira.mongodb.org/browse/SERVER-121912 for more information."}

> docker run mongo:8.3

{"t":\{"$date":"2026-10-04T19:15:43.620+00:00"}

,"s":"F",  "c":"CONTROL",  "id":12257600,"ctx":"main","msg":"MongoDB cannot start: Linux kernel versions 6.19 and newer has a known incompatibility with this version of MongoDB. See https://jira.mongodb.org/browse/SERVER-121912 for more information."}

 

> docker run mongo:8.2

... success