Medium severity · published Dec 15, 2020
CVE-2020-29568
An issue was discovered in Xen through 4.14.x
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
XE
Xen · Xen
through 4.14.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29568
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-29568
Mailing List
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
Mailing List
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Third Party Advisory
https://security.gentoo.org/glsa/202107-30
Third Party Advisory
https://www.debian.org/security/2021/dsa-4843
Patch
https://xenbits.xenproject.org/xsa/advisory-349.html
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