CVE-2020-28916

QEMU: e1000e: infinite loop scenario in case of null packet descriptor

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

hw/net/e1000e_core.c in QEMU 5.0.0 has an infinite loop via an RX descriptor with a NULL buffer address.

El archivo hw/net/e1000e_core.c en QEMU versión 5.0.0, presenta un bucle infinito por medio de un descriptor RX con una dirección de búfer NULL

An infinite loop flaw was found in the e1000e device emulator in QEMU. This issue could occur while receiving packets via the e1000e_write_packet_to_guest() routine, if the receive(RX) descriptor has a NULL buffer address. This flaw allows a privileged guest user to cause a denial of service. The highest threat from this vulnerability is to system availability.

It was discovered that QEMU incorrectly handled memory in iSCSI emulation. An attacker inside the guest could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. Alexander Bulekov discovered that QEMU incorrectly handled Intel e1000e emulation. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-11-18 CVE Reserved
2020-12-04 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (6)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html	Mailing List
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html	Mailing List

URL	Date	SRC
https://lists.nongnu.org/archive/html/qemu-devel/2020-11/msg03185.html	2024-08-04

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2020/12/01/2	2022-09-30

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2020-28916	2021-05-18
https://bugzilla.redhat.com/show_bug.cgi?id=1903064	2021-05-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				5.0.0 Search vendor "Qemu" for product "Qemu" and version "5.0.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected