CVE - CVE-2022-42332

CVE-ID
CVE-2022-42332	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
x86 shadow plus log-dirty mode use-after-free In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Shadow mode maintains a pool of memory used for both shadow page tables as well as auxiliary data structures. To migrate or snapshot guests, Xen additionally runs them in so called log-dirty mode. The data structures needed by the log-dirty tracking are part of aformentioned auxiliary data. In order to keep error handling efforts within reasonable bounds, for operations which may require memory allocations shadow mode logic ensures up front that enough memory is available for the worst case requirements. Unfortunately, while page table memory is properly accounted for on the code path requiring the potential establishing of new shadows, demands by the log-dirty infrastructure were not taken into consideration. As a result, just established shadow page tables could be freed again immediately, while other code is still accessing them on the assumption that they would remain allocated.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
GENTOO:GLSA-202402-07 URL:https://security.gentoo.org/glsa/202402-07 MISC:DSA-5378 URL:https://www.debian.org/security/2023/dsa-5378 MISC:FEDORA-2023-703f133eb3 URL:https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APBMS2Q6746AXAFAITNJMGBNFGNMVLWR/ MISC:FEDORA-2023-da8315e641 URL:https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L6PM4RE7MUE6OWA32ZVOXCP235RM2TM/ MISC:[oss-security] 20230321 Xen Security Advisory 427 v2 (CVE-2022-42332) - x86 shadow plus log-dirty mode use-after-free URL:http://www.openwall.com/lists/oss-security/2023/03/21/1 MISC:http://xenbits.xen.org/xsa/advisory-427.html URL:http://xenbits.xen.org/xsa/advisory-427.html MISC:https://xenbits.xenproject.org/xsa/advisory-427.txt URL:https://xenbits.xenproject.org/xsa/advisory-427.txt
Assigning CNA
Xen Project
Date Record Created
20221003	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 (20221003)
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)