CVE-2024-50096

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error<br /> <br /> The `nouveau_dmem_copy_one` function ensures that the copy push command is<br /> sent to the device firmware but does not track whether it was executed<br /> successfully.<br /> <br /> In the case of a copy error (e.g., firmware or hardware failure), the<br /> copy push command will be sent via the firmware channel, and<br /> `nouveau_dmem_copy_one` will likely report success, leading to the<br /> `migrate_to_ram` function returning a dirty HIGH_USER page to the user.<br /> <br /> This can result in a security vulnerability, as a HIGH_USER page that may<br /> contain sensitive or corrupted data could be returned to the user.<br /> <br /> To prevent this vulnerability, we allocate a zero page. Thus, in case of<br /> an error, a non-dirty (zero) page will be returned to the user.