Vulnerability CVE-2022-48771
Published: 2024-06-20

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

drm/vmwgfx: Fix stale file descriptors on failed usercopy

A failing usercopy of the fence_rep object will lead to a stale entry in
the file descriptor table as put_unused_fd() won't release it. This
enables userland to refer to a dangling 'file' object through that still
valid file descriptor, leading to all kinds of use-after-free
exploitation scenarios.

Fix this by deferring the call to fd_install() until after the usercopy
has succeeded.

 References:
https://git.kernel.org/stable/c/e8d092a62449dcfc73517ca43963d2b8f44d0516
https://git.kernel.org/stable/c/0008a0c78fc33a84e2212a7c04e6b21a36ca6f4d
https://git.kernel.org/stable/c/84b1259fe36ae0915f3d6ddcea6377779de48b82
https://git.kernel.org/stable/c/ae2b20f27732fe92055d9e7b350abc5cdf3e2414
https://git.kernel.org/stable/c/6066977961fc6f437bc064f628cf9b0e4571c56c
https://git.kernel.org/stable/c/1d833b27fb708d6fdf5de9f6b3a8be4bd4321565
https://git.kernel.org/stable/c/a0f90c8815706981c483a652a6aefca51a5e191c
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