Linux Kernel up to 5.5.2 drivers/tty/vt/vt.c vc_do_resize use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$5k-$25k	0.00

A vulnerability classified as critical was found in Linux Kernel up to 5.5.2 (Operating System). This vulnerability affects the function vc_do_resize of the file drivers/tty/vt/vt.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vc_do_resize function in drivers/tty/vt/vt.c.

The weakness was disclosed 02/06/2020. This vulnerability was named CVE-2020-8647 since 02/06/2020. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 02/06/2020).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-149754 and VDB-149753 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/06/2020 🔍
02/06/2020 +0 days 🔍
02/06/2020 +0 days 🔍
03/28/2024 +1512 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: DLA 2241-1
Status: Not defined

CVE: CVE-2020-8647 (🔍)
GCVE (CVE): GCVE-0-2020-8647
GCVE (VulDB): GCVE-100-149752
See also: 🔍

Entryinfo

Created: 02/06/2020 01:13 PM
Updated: 03/28/2024 05:43 PM
Changes: 02/06/2020 01:13 PM (38), 02/06/2020 01:18 PM (18), 03/28/2024 05:43 PM (18)
Complete: 🔍
Cache ID: 18:329:40