Red Hat Enterprise Linux 9pfs use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$5k-$25k0.18+

Summaryinfo

A vulnerability classified as very critical was found in Red Hat Enterprise Linux, Enterprise Linux for NVIDIA, OpenShift Container Platform and OpenStack Platform. This affects an unknown function of the component 9pfs. Executing a manipulation can lead to use after free. This vulnerability is tracked as CVE-2026-93834. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Red Hat Enterprise Linux, Enterprise Linux for NVIDIA, OpenShift Container Platform and OpenStack Platform (version unknown) and classified as very critical. This vulnerability affects an unknown function of the component 9pfs. 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2026-93834 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/25/2026).

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.4
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.9
VulDB Temp Score: 9.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/18/2026 CVE reserved
09/25/2026 +7 days Advisory disclosed
09/25/2026 +0 days VulDB entry created
09/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: redhat.com

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-93834 (🔒)
GCVE (CVE): GCVE-0-2026-93834
GCVE (VulDB): GCVE-100-410242

Entryinfo

Created: 09/25/2026 16:00
Changes: 09/25/2026 16:00 (26), 09/25/2026 16:01 (35)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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