opencontainers runc Mount race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in opencontainers runc and classified as problematic. The impacted element is an unknown function of the component Mount Handler. This manipulation causes race condition. This vulnerability is tracked as CVE-2025-31133. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in opencontainers runc (the affected version unknown). Affected by this vulnerability is an unknown part of the component Mount Handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container's /dev/null) was actually a real /dev/null inode when using the container's /dev/null to mask. This exposes two methods of attack: an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.

It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2025-31133. The exploitation appears to be difficult. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 274068 (Fedora 44 : runc (2025-6a0f63aaab)), 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 databases at Tenable (274068), EUVD (EUVD-2025-37945) and CERT Bund (WID-SEC-2025-2518). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Google Cloud Platform
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Red Hat OpenShift
  • Docker Desktop
  • Dell NetWorker

Productinfo

Type

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 4.6
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 274068
Nessus Name: Fedora 44 : runc (2025-6a0f63aaab)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/05/2025 Advisory disclosed
11/05/2025 +0 days VulDB entry created
02/02/2026 +89 days VulDB entry last update

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2025-31133 (🔒)
GCVE (CVE): GCVE-0-2025-31133
GCVE (VulDB): GCVE-100-331327
EUVD: 🔒
CERT Bund: WID-SEC-2025-2518 - Red Hat Enterprise Linux (runc): Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 11/05/2025 20:43
Updated: 02/02/2026 10:43
Changes: 11/05/2025 20:43 (49), 11/06/2025 14:25 (2), 11/06/2025 23:33 (1), 11/13/2025 09:51 (7), 11/13/2025 12:54 (1), 11/24/2025 13:18 (1), 11/28/2025 07:07 (1), 12/04/2025 03:27 (24), 12/21/2025 18:58 (1), 02/02/2026 10:43 (1)
Complete: 🔍
Cache ID: 216:36C:103

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

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