Linux Kernel up to 6.2.8 emac.c emac_remove use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.2.8 and classified as problematic. Affected by this issue is the function emac_remove of the file drivers/net/ethernet/qualcomm/emac/emac.c. This manipulation causes use after free. This vulnerability is handled as CVE-2023-33203. It is feasible to perform the attack on the physical device. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.2.8 (Operating System) and classified as problematic. Affected by this vulnerability is the function emac_remove of the file drivers/net/ethernet/qualcomm/emac/emac.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. The impact remains unknown. The summary by CVE is:

The Linux kernel before 6.2.9 has a race condition and resultant use-after-free in drivers/net/ethernet/qualcomm/emac/emac.c if a physically proximate attacker unplugs an emac based device.

The weakness was released 05/18/2023. It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2023-33203 since 05/18/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 266262 (NewStart CGSL MAIN 6.06 : kernel Multiple Vulnerabilities (NS-SA-2025-0237)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.2.9 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (266262) and EUVD (EUVD-2023-37373). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.4
NVD Vector: 🔍

CVSSv2info

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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: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 266262
Nessus Name: NewStart CGSL MAIN 6.06 : kernel Multiple Vulnerabilities (NS-SA-2025-0237)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.2.9
Patch: git.kernel.org

Timelineinfo

05/18/2023 🔍
05/18/2023 +0 days 🔍
05/18/2023 +0 days 🔍
01/03/2026 +961 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-33203 (🔍)
GCVE (CVE): GCVE-0-2023-33203
GCVE (VulDB): GCVE-100-229351
EUVD: 🔍

Entryinfo

Created: 05/18/2023 13:46
Updated: 01/03/2026 19:40
Changes: 05/18/2023 13:46 (43), 06/10/2023 15:34 (11), 10/01/2025 09:11 (16), 01/03/2026 19:40 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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