Free5GC up to 4.2.3 Gmm handler.go race condition

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k1.01

Summaryinfo

A vulnerability described as problematic has been identified in Free5GC up to 4.2.3. This issue affects some unknown processing of the file /corefuzzer_deps/free5gc/NFs/amf/internal/gmm/handler.go of the component Gmm Handler. Such manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2026-94043. The attack can be launched remotely. Moreover, an exploit is present. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Free5GC up to 4.2.3. Affected by this issue is an unknown code block of the file /corefuzzer_deps/free5gc/NFs/amf/internal/gmm/handler.go of the component Gmm Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-94043. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a exploit are known.

It is declared as proof-of-concept.

Applying the patch e323b01464355781b8b8d5dd695e05cbc00a62f2 is able to eliminate this problem. The bugfix is ready for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: e323b01464355781b8b8d5dd695e05cbc00a62f2

Timelineinfo

09/19/2026 Advisory disclosed
09/19/2026 +0 days VulDB entry created
09/19/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 1109
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-94043 (🔒)
GCVE (CVE): GCVE-0-2026-94043
GCVE (VulDB): GCVE-100-407972
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/19/2026 23:25
Changes: 09/19/2026 23:25 (57)
Complete: 🔍
Submitter: JinboXu
Cache ID: 216::103

Submitinfo

Accepted

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