Products
Linux kernel
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Tags
CVE-2022-48700 details
Last Modified : May 3, 2024, 4:15 p.m.
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.
CVSS Score
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Weakness
Weakness | Name | Description |
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References
URL | Source |
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https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |