CVE - CVE-2022-48700

CVE-ID
CVE-2022-48700	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 URL:https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 MISC:https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 URL:https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 MISC:https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 URL:https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 MISC:https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 URL:https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4
Assigning CNA
kernel.org
Date Record Created
20240503	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240503)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)