CVE-2024-50096 Information

Description

In the Linux kernel the following vulnerability has been resolved:

nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error

The nouveau_dmem_copy_one function ensures that the copy push command is sent to the device firmware but does not track whether it was executed successfully.

In the case of a copy error (e.g. firmware or hardware failure) the copy push command will be sent via the firmware channel and nouveau_dmem_copy_one will likely report success leading to the migrate_to_ram function returning a dirty HIGH_USER page to the user.

This can result in a security vulnerability as a HIGH_USER page that may contain sensitive or corrupted data could be returned to the user.

To prevent this vulnerability we allocate a zero page. Thus in case of an error a non-dirty (zero) page will be returned to the user.

Reference

https://git.kernel.org/stable/c/73f75d2b5aee5a735cf64b8ab4543d5c20dbbdd9 https://git.kernel.org/stable/c/8c3de9282dde21ce3c1bf1bde3166a4510547aa9 https://git.kernel.org/stable/c/614bfb2050982d23d53d0d51c4079dba0437c883 https://git.kernel.org/stable/c/697e3ddcf1f8b68bd531fc34eead27c000bdf3e1 https://git.kernel.org/stable/c/ab4d113b6718b076046018292f821d5aa4b844f8 https://git.kernel.org/stable/c/835745a377a4519decd1a36d6b926e369b3033e2