CVE - CVE-2021-28696

CVE-ID
CVE-2021-28696	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
DEBIAN:DSA-4977 URL:https://www.debian.org/security/2021/dsa-4977 FEDORA:FEDORA-2021-081f9bf5d2 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/ FEDORA:FEDORA-2021-4f129cc0c1 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/ FEDORA:FEDORA-2021-d68ed12e46 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/ GENTOO:GLSA-202208-23 URL:https://security.gentoo.org/glsa/202208-23 MISC:https://xenbits.xenproject.org/xsa/advisory-378.txt URL:https://xenbits.xenproject.org/xsa/advisory-378.txt MLIST:[oss-security] 20210901 Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 URL:http://www.openwall.com/lists/oss-security/2021/09/01/5 MLIST:[oss-security] 20210901 Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 URL:http://www.openwall.com/lists/oss-security/2021/09/01/6 MLIST:[oss-security] 20210901 Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 URL:http://www.openwall.com/lists/oss-security/2021/09/01/1
Assigning CNA
Xen Project
Date Record Created
20210318	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 (20210318)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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