CVE-2021-20257
QEMU: net: e1000: infinite loop while processing transmit descriptors
Severity Score
6.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Se ha encontrado un fallo de bucle infinito en el emulador NIC e1000 de QEMU. Este problema se produce mientras son procesados descriptores de transmisión (tx) en la función process_tx_desc si varios campos del descriptor son inicializados con valores no válidos. Este fallo permite a un huésped consumir ciclos de CPU en el host, resultando en una denegación de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2020-12-17 CVE Reserved
- 2021-07-15 CVE Published
- 2023-06-21 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CAPEC
References (8)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html | Mailing List |
|
| https://security.netapp.com/advisory/ntap-20220425-0003 | Third Party Advisory |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://security.gentoo.org/glsa/202208-27 | 2023-02-12 | |
| https://access.redhat.com/security/cve/CVE-2021-20257 | 2022-01-11 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Redhat Search vendor "Redhat" | Codeready Linux Builder Search vendor "Redhat" for product "Codeready Linux Builder" | - | - |
Affected
| in | Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Safe
|
| Redhat Search vendor "Redhat" | Codeready Linux Builder Search vendor "Redhat" for product "Codeready Linux Builder" | - | - |
Affected
| in | Redhat Search vendor "Redhat" | Enterprise Linux For Ibm Z Systems Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" and version "8.0" | - |
Safe
|
| Redhat Search vendor "Redhat" | Codeready Linux Builder Search vendor "Redhat" for product "Codeready Linux Builder" | - | - |
Affected
| in | Redhat Search vendor "Redhat" | Enterprise Linux For Power Little Endian Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" and version "8.0" | - |
Safe
|
| Qemu Search vendor "Qemu" | Qemu Search vendor "Qemu" for product "Qemu" | < 6.2.0 Search vendor "Qemu" for product "Qemu" and version " < 6.2.0" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Openstack Platform Search vendor "Redhat" for product "Openstack Platform" | 10.0 Search vendor "Redhat" for product "Openstack Platform" and version "10.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Openstack Platform Search vendor "Redhat" for product "Openstack Platform" | 13.0 Search vendor "Redhat" for product "Openstack Platform" and version "13.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 6.0 Search vendor "Redhat" for product "Enterprise Linux" and version "6.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | advanced_virtualization |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux For Ibm Z Systems Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux For Power Little Endian Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" and version "8.0" | - |
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
| ||||||