CVE-2020-29571

An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.

Link	Resource
https://xenbits.xenproject.org/xsa/advisory-359.html	Patch Vendor Advisory
https://www.debian.org/security/2020/dsa-4812	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202107-30	Third Party Advisory

Configuration 1

cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

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Published : 2020-12-15 05:15

Updated : 2021-12-10 01:57

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NVD link : CVE-2020-29571

Mitre link : CVE-2020-29571

No products.

CWE-476