CVE-2022-48700
Linux VFIO Type1 Zero Page Reference Count Leak
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
INFO
Published Date :
May 3, 2024, 4:15 p.m.
Last Modified :
Dec. 19, 2024, 11:15 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2022-48700 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-48700 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Rejected by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dec. 19, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dec. 19, 2024
Action Type Old Value New Value Changed 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. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. Removed Reference kernel.org: https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 Removed Reference kernel.org: https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 Removed Reference kernel.org: https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 Removed Reference kernel.org: https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 Removed Reference CVE: https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 Removed Reference CVE: https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 Removed Reference CVE: https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 Removed Reference CVE: https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 Added Reference https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 Added Reference https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 Added Reference https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 03, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/578d644edc7d2c1ff53f7e4d0a25da473deb4a03 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5321908ef74fb593e0dbc8737d25038fc86c9986 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5d721bf222936f5cf3ee15ced53cc483ecef7e46 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-48700 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-48700
weaknesses.