Home/CVE/An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch event
CVE

CVE-2020-29568

An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch event

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.

MEDIUM · CVSS 6.5 EPSS 0.00226
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

2
xen<= 4.14.1
debian linuxall versions
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Dec 2020 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
⚑

Vendor Advisories

17
usnUSN-4749-1
usnUSN-4751-1
usnUSN-4750-1
usnUSN-4748-1
suse-csafSUSE-SU-2021:0532-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202107-30Third Party Advisory
https://www.debian.org/security/2021/dsa-4843Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-349.htmlPatchVendor Advisory
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