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An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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OR
*cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
*cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Removed
CWE
NIST CWE-20
Changed
Reference Type
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ No Types Assigned
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ Mailing List, Third Party Advisory
Changed
Reference Type
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ No Types Assigned
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ Mailing List, Third Party Advisory
Changed
Reference Type
https://security.gentoo.org/glsa/202007-02 No Types Assigned
https://security.gentoo.org/glsa/202007-02 Third Party Advisory
CWE Remap by NIST7/21/2021 7:39:23 AM
Action
Type
Old Value
New Value
Changed
CWE
CWE-20
CWE-119
CWE-20
CPE Deprecation Remap by NIST8/18/2020 11:05:57 AM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*
OR
*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*