💣Exploit CVE-2022-48700 - In the Linux kernel, the following vulnerability h

[Maksim]

CVE ID : CVE-2022-48700
Published : May 3, 2024, 4:15 p.m. | 1 hour, 4 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: vfio/type1: Unpin zero pages There's currently a reference count leak on the zero page. We increment the reference via pin_user_pages_remote(), but the page is later handled as an invalid/reserved page, therefore it's not accounted against the user and not unpinned by our put_pfn(). Introducing special zero page handling in put_pfn() would resolve the leak, but without accounting of the zero page, a single user could still create enough mappings to generate a reference count overflow. The zero page is always resident, so for our purposes there's no reason to keep it pinned. Therefore, add a loop to walk pages returned from pin_user_pages_remote() and unpin any zero pages.
Severity: 0.0 | NA
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