In the Linux kernel, the following vulnerability has been resolved:
vduse: hold vduse_lock across IDR lookup in open path
vduse_dev_open() looks up struct vduse_dev through the IDR and then acquires dev->lock only after vduse_lock has been dropped.
This leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the same object from the IDR and free it before the open path locks the device, leading to a use-after-free.
Close this race by keeping vduse_lock held until dev->lock has been acquired in the open path, matching the lock ordering already used by the destroy path.
References
- https://git.kernel.org/stable/c/35483c5306e09b3190ff937089d404a78012695c
- https://git.kernel.org/stable/c/5c1560be8aa6849356455af67518d35c551cbd95
- https://git.kernel.org/stable/c/79e12c891940b0c4c75881b7fd82a8cbb8ac97be
- https://git.kernel.org/stable/c/93ed4692f2299a40346025979f40e4a9b7b33af7
- https://git.kernel.org/stable/c/a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2
- https://git.kernel.org/stable/c/d94e2947203aead590fd63f667d316d4475d65af
- https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce