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vmwgfx Driver File Descriptor Handling Priv Esc

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vmwgfx Driver File Descriptor Handling Priv Esc



If the vmwgfx driver fails to copy the 'fence_rep' object to userland, it tries to recover by deallocating the (already populated) file descriptor. This is wrong, as the fd gets released via put_unused_fd() which shouldn't be used, as the fd table slot was already populated via the previous call to fd_install(). This leaves userland with a valid fd table entry pointing to a free'd 'file' object. We use this bug to overwrite a SUID binary with our payload and gain root. Linux kernel 4.14-rc1 - 5.17-rc1 are vulnerable. Successfully tested against Ubuntu 22.04.01 with kernel 5.13.12-051312-generic.


  • h00die
  • Mathias Krause




x86, x64


Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/linux/local/vmwgfx_fd_priv_esc
msf exploit(vmwgfx_fd_priv_esc) > show targets
msf exploit(vmwgfx_fd_priv_esc) > set TARGET < target-id >
msf exploit(vmwgfx_fd_priv_esc) > show options
    ...show and set options...
msf exploit(vmwgfx_fd_priv_esc) > exploit

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