CVE-2020-29570

An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.

• CWE-770

• http://www.openwall.com/lists/oss-security/2020/12/16/4Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
• https://security.gentoo.org/glsa/202107-30Third Party Advisory
• https://www.debian.org/security/2020/dsa-4812Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-358.htmlPatch, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2020/12/16/4Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
• https://security.gentoo.org/glsa/202107-30Third Party Advisory
• https://www.debian.org/security/2020/dsa-4812Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-358.htmlPatch, Vendor Advisory

Published

Dec 15, 2020

Last Modified

Jun 17, 2026

Status

Modified

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