CVE-2020-29569

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

• CWE-416

• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202107-30Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210205-0001/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4843Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-350.htmlPatch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202107-30Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210205-0001/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4843Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-350.htmlPatch, Vendor Advisory

Published

Dec 15, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-29563An issue was discovered on Western Digital My Cloud OS 5 dev…9.8
• CVE-2020-29564The official Consul Docker images 0.7.1 through 1.4.2 contai…9.8
• CVE-2020-29565An issue was discovered in OpenStack Horizon before 15.3.2, …6.1
• CVE-2020-29566An issue was discovered in Xen through 4.14.x. When they req…5.5
• CVE-2020-29567An issue was discovered in Xen 4.14.x. When moving IRQs betw…6.2
• CVE-2020-29568An issue was discovered in Xen through 4.14.x. Some OSes (su…6.5
• CVE-2020-29570An issue was discovered in Xen through 4.14.x. Recording of …6.2
• CVE-2020-29571An issue was discovered in Xen through 4.14.x. A bounds chec…6.2
• CVE-2020-29572app/View/Elements/genericElements/SingleViews/Fields/generic…6.1
• CVE-2020-29573sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or l…7.5
• CVE-2020-29574An SQL injection vulnerability in the WebAdmin of Cyberoam O…9.8
• CVE-2020-29575The official elixir Docker images before 1.8.0-alpine (Alpin…9.8