As far as I understand Sitecore initially used the same version naming for Sitecore.Logging as log4net. For example, when I look on Sitecore 6.6.0 rev. 120918 I see 22.214.171.124715. Same version is for example for 8.0 rev. 141020.
When you will look on different Sitecore.Logging assemblies on MyGet server you will see that that till Sitecore 8.2, log4net version was 126.96.36.199715.
It means that if you use old Sitecore version, locking bug will be there.
For newer versions Sitecore started to use new naming convention and it is hard to identify what log4net version is baked inside.