In the Linux kernel, the following vulnerability has been resolved:

virtiofs: fix UAF on submount umount

iput() called from fuse_release_end() can Oops if the super block has
already been destroyed.  Normally this is prevented by waiting for
num_waiting to go down to zero before commencing with super block shutdown.

This only works, however, for the last submount instance, as the wait
counter is per connection, not per superblock.

Revert to using synchronous release requests for the auto_submounts case,
which is virtiofs only at this time.

https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea

https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce

https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e

https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe

https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9

https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b

https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42

https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f

https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f

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