Ubuntu Linux overlayfs authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
7.8$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical has been found in Ubuntu Linux. This issue affects some unknown processing of the component overlayfs. Performing a manipulation results in authorization. This vulnerability is reported as CVE-2023-2640. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability was found in Ubuntu Linux (Operating System) (version now known). It has been classified as critical. This affects some unknown processing of the component overlayfs. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

The weakness was disclosed 07/26/2023 as USN-6250-1. The advisory is shared at wiz.io. This vulnerability is uniquely identified as CVE-2023-2640 since 05/10/2023. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 315743 (Ubuntu 22.04 LTS : Linux kernel (Xilinx ZynqMP) vulnerabilities (USN-8275-1)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (315743). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.8

VulDB Base Score: 7.8
VulDB Temp Score: 7.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Canonical Ltd.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 315743
Nessus Name: Ubuntu 22.04 LTS : Linux kernel (Xilinx ZynqMP) vulnerabilities (USN-8275-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/10/2023 🔍
07/26/2023 +77 days 🔍
07/26/2023 +0 days 🔍
05/21/2026 +1030 days 🔍

Sourcesinfo

Vendor: ubuntu.com

Advisory: USN-6250-1
Status: Not defined

CVE: CVE-2023-2640 (🔍)
GCVE (CVE): GCVE-0-2023-2640
GCVE (VulDB): GCVE-100-235437

Entryinfo

Created: 07/26/2023 10:47
Updated: 05/21/2026 21:41
Changes: 07/26/2023 10:47 (48), 05/21/2026 21:41 (17)
Complete: 🔍
Cache ID: 216::103

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

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