CVE-2020-29570
Medium
Description
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.
SeverityMedium
CVSS6.2
Exploit probability—
Product
Xen
PublishedDec 15, 2020
First seenDec 15, 2020
How to fix
Vendor advisories
- debian.org/security/2020/dsa-4812
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
- security.gentoo.org/glsa/202107-30
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xen xen | 4.4.0 ≤ v ≤ 4.14.0 | — |
| debian debian_linux | 10.0 | — |
| fedoraproject fedora | 32, 33 | — |
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