CVE-2021-33656
kernel: when setting font with malicious data by ioctl PIO_FONT, kernel will write memory out of bounds
Severity Score
6.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
Cuando es establecida la fuente con datos maliciosos por ioctl cmd PIO_FONT, el kernel escribirá memoria fuera de límites
An out-of-bounds write flaw was found in the Linux kernel’s console driver functionality in the way a user triggers the ioctl PIO_FONT with malicious data. This flaw allows a local user to crash or potentially escalate their privileges on the system.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-05-28 CVE Reserved
- 2022-07-18 CVE Published
- 2024-02-23 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-787: Out-of-bounds Write
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html | Mailing List |
|
| https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-33656 | 2023-08-29 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2108696 | 2023-08-29 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Huawei Search vendor "Huawei" | Openeuler Search vendor "Huawei" for product "Openeuler" | 20.03 Search vendor "Huawei" for product "Openeuler" and version "20.03" | lts |
Affected
| ||||||
| Huawei Search vendor "Huawei" | Openeuler Search vendor "Huawei" for product "Openeuler" | 20.03 Search vendor "Huawei" for product "Openeuler" and version "20.03" | sp1, lts |
Affected
| ||||||
| Huawei Search vendor "Huawei" | Openeuler Search vendor "Huawei" for product "Openeuler" | 20.03 Search vendor "Huawei" for product "Openeuler" and version "20.03" | sp3, lts |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.10.127 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.127" | - |
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
| ||||||