Public bug reported:

https://www.openwall.com/lists/oss-security/2021/02/04/5

The following mainline patch is required for >= groovy:

[linux] c518adafa39f vsock: fix the race conditions in multi-transport support
[linux-5.10-y] 55d900415b81 vsock: fix the race conditions in multi-transport 
support

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Groovy)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Hirsute)
     Importance: Undecided
         Status: Incomplete

** Also affects: linux (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Groovy)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1914668

Title:
  Exploitable vulnerabilities in AF_VSOCK implementation

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