VDB-231757 · CVE-2023-35788 · EUVD-2023-39785

Linux Kernel up to 6.3.6 Flower Classifier net/sched/cls_flower.c fl_set_geneve_opt out-of-bounds write

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.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.3.6. This impacts the function fl_set_geneve_opt of the file net/sched/cls_flower.c of the component Flower Classifier. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2023-35788. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.3.6 (Operating System). It has been declared as critical. Affected by this vulnerability is the function fl_set_geneve_opt of the file net/sched/cls_flower.c of the component Flower Classifier. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

The weakness was disclosed 06/17/2023. The advisory is shared at cdn.kernel.org. This vulnerability is known as CVE-2023-35788 since 06/16/2023. Technical details are known, but no exploit is available.

Upgrading to version 6.3.7 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-39785). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

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: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
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: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / 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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.3.7

Timelineinfo

06/16/2023 🔍
06/17/2023 +1 days 🔍
06/17/2023 +0 days 🔍
01/10/2026 +938 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: cdn.kernel.org
Status: Confirmed

CVE: CVE-2023-35788 (🔍)
GCVE (CVE): GCVE-0-2023-35788
GCVE (VulDB): GCVE-100-231757
EUVD: 🔍

Entryinfo

Created: 06/17/2023 07:53
Updated: 01/10/2026 16:56
Changes: 06/17/2023 07:53 (44), 07/14/2023 13:56 (11), 06/26/2024 21:47 (15), 01/10/2026 16:56 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.