Medium severity · published Dec 15, 2020
CVE-2020-29570
An issue was discovered in Xen through 4.14.x
6.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0 · source: NVD
FE
Fedora · Fedoraproject
32; 33 · source: NVD
XE
Xen · Xen
4.4.0 through 4.14.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29570
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-29570
Mailing List
http://www.openwall.com/lists/oss-security/2020/12/16/4
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
Third Party Advisory
https://security.gentoo.org/glsa/202107-30
Third Party Advisory
https://www.debian.org/security/2020/dsa-4812
Patch
https://xenbits.xenproject.org/xsa/advisory-358.html
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