HIGH

CVE-2025-31133

CVSS v3

7.8

HIGH

EPSS Score

0.8 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

github.com/opencontainers/runcGoall versions · fixed in 1.2.8
aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+4047+545787c4
buildahAlmaLinux:8all versions · fixed in 2:1.33.12-2.module_el8.10.0+4016+efd18bf8
buildah-testsAlmaLinux:8all versions · fixed in 2:1.33.12-2.module_el8.10.0+4047+545787c4
cockpit-podmanAlmaLinux:8all versions · fixed in 84.1-1.module_el8.10.0+4016+efd18bf8
conmonAlmaLinux:8all versions · fixed in 3:2.1.10-1.module_el8.10.0+4068+0e21408f
container-selinuxAlmaLinux:8all versions · fixed in 2:2.229.0-2.module_el8.10.0+3909+6e1c1eb7
containernetworking-pluginsAlmaLinux:8all versions · fixed in 1:1.4.0-6.module_el8.10.0+4068+0e21408f

20 more package ranges on OSV.dev

Vendor advisories

CVE-2025-31133 Red Hat Product Security1,217 products fixed
runc: container escape via 'masked path' abuse due to mount race conditions
RHSA-2026:10703 Red Hat Product Security435 products fixed
Red Hat Security Advisory: container-tools:rhel8 security update
RHSA-2026:8325 Red Hat Product Security13 products fixed
Red Hat Security Advisory: buildah, crun, podman, runc, and skopeo security update
RHSA-2026:6492 Red Hat Product Security1 product fixed
Red Hat Security Advisory: OpenShift Container Platform 4.12.87 bug fix and security update
RHSA-2026:4693 Red Hat Product Security227 products fixed
Red Hat Security Advisory: container-tools:rhel8 security update
RHSA-2026:4531 Red Hat Product Security13 products fixed
Red Hat Security Advisory: runc security update

19 more advisories

Full record on NVD

Description

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.

Technical details

Published: 2025-11-06

Frequently asked questions

What is CVE-2025-31133?

Is CVE-2025-31133 actively exploited?

Active exploitation of CVE-2025-31133 has not been confirmed. Its EPSS score was 0.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-31133?

CVE-2025-31133 has a CVSS v3 base score of 7.8 (HIGH severity).

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