VDB-233367 · CVE-2023-3567 · EUVD-2023-44218

Linux Kernel vc_screen.c vcs_read use after free

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6.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel. This affects the function vcs_read of the file drivers/tty/vt/vc_screen.c. Performing a manipulation results in use after free. This vulnerability is reported as CVE-2023-3567. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (affected version unknown). It has been classified as problematic. This affects the function vcs_read of the file drivers/tty/vt/vc_screen.c. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux Kernel. This issue may allow an attacker with local user access to cause a system crash or leak internal kernel information.

The weakness was disclosed 07/09/2023. It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2023-3567 since 07/09/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 235071 (Amazon Linux 2 : kernel (ALAS-2025-2834)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at spinics.net.

The vulnerability is also documented in the databases at Tenable (235071) and EUVD (EUVD-2023-44218). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CNA Base Score: 7.1
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 235071
Nessus Name: Amazon Linux 2 : kernel (ALAS-2025-2834)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: spinics.net

Timelineinfo

07/09/2023 🔍
07/09/2023 +0 days 🔍
07/09/2023 +0 days 🔍
07/24/2025 +746 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2023-3567 (🔍)
GCVE (CVE): GCVE-0-2023-3567
GCVE (VulDB): GCVE-100-233367
EUVD: 🔍

Entryinfo

Created: 07/09/2023 16:49
Updated: 07/24/2025 02:46
Changes: 07/09/2023 16:49 (39), 09/13/2024 21:42 (36), 05/02/2025 06:34 (2), 07/24/2025 02:46 (1)
Complete: 🔍
Cache ID: 216::103