CVE-2025-31133

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{"affected": [{"affectedData": [{"product": "runc", "vendor": "opencontainers", "versions": [{"status": "affected", "version": "< 1.2.8"}, {"status": "affected", "version": ">= 1.3.0-rc.1, < 1.3.3"}, {"status": "affected", "version": ">= 1.4.0-rc.1, <= 1.4.0-rc.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*", "matchCriteriaId": "889E52A1-D7B0-4DC8-BD63-9413A1DD9EEB", "versionEndExcluding": "1.2.8", "vulnerable": true}, {"criteria": "cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3193A96-E882-439B-984E-782315C62F69", "versionEndExcluding": "1.3.3", "versionStartIncluding": "1.3.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:linuxfoundation:runc:1.4.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "082E3496-822B-481B-AC2F-DA8DCAFC28FF", "vulnerable": true}, {"criteria": "cpe:2.3:a:linuxfoundation:runc:1.4.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "71C62E90-6357-44A4-B582-28B1F1D9B16D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "runc es una herramienta CLI para generar y ejecutar contenedores seg\u00fan la especificaci\u00f3n OCI. En las versiones 1.2.7 e inferiores, 1.3.0-rc.1 hasta 1.3.1, 1.4.0-rc.1 y 1.4.0-rc.2, runc no realizaba una verificaci\u00f3n suficiente de que el origen del bind-mount (es decir, el [SystemPath] del contenedor) era realmente un inodo [SystemPath] real al usar el [SystemPath] del contenedor para enmascarar. Esto expone dos m\u00e9todos de ataque: un gadget de montaje arbitrario, lo que lleva a la revelaci\u00f3n de informaci\u00f3n del host, denegaci\u00f3n de servicio del host, escape del contenedor o una elusi\u00f3n de maskedPaths. Este problema est\u00e1 solucionado en las versiones 1.2.8, 1.3.3 y 1.4.0-rc.3."}], "id": "CVE-2025-31133", "lastModified": "2026-10-07T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-31133", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-11-06T19:03:45.356326Z", "version": "2.0.3"}}]}, "published": "2025-11-06T19:15:41.343", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9f"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Patch", "Third Party Advisory"], "url": "https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-61"}, {"lang": "en", "value": "CWE-363"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "runc: container escape via 'masked path' abuse due to mount race conditions", "id": "2404705", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2404705"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["A flaw was found in runc. This flaw exploits an issue with how masked paths are implementedin runc. When masking files, runc will bind-mount the container's /dev/null inode on top of the file. However, if an attacker can replace /dev/null with a symlink to some other procfs file, runc will instead bind-mount the symlink target read-write."], "mitigation": {"lang": "en:us", "value": "Potential mitigations for this issue include:\n* Using user namespaces, with the host root user not mapped into the container's namespace. procfs file permissions are managed using Unix\nDAC and thus user namespaces stop a container process from being able to write to them.\n* Not running as a root user in the container (this includes disabling setuid binaries with noNewPrivileges). As above, procfs file permissions are managed using Unix DAC and thus non-root users cannot write to them.\n* Depending on the maskedPath configuration (the default configuratio nonly masks paths in /proc and /sys), using an AppArmor that blocks unexpectedwrites to any maskedPaths (as is the case with the defaultprofile used by Docker and Podman) will block attempts to exploit this issue. However, CVE-2025-52881 allows an attacker to bypass LSMlabels, and so this mitigation is not helpful when considered incombination with CVE-2025-52881."}, "name": "CVE-2025-31133", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "container-tools:rhel8/runc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "runc", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "runc", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2025-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-31133\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-31133"], "statement": "Red Hat considers this as an Important flaw since the impact is limited to local attack with minimal privileges in order to jeopardize the environment.", "threat_severity": "Important"}

{"created": "2025-11-06T20:19:06.332639+00:00", "updated": "2025-11-06T20:19:06.332675+00:00", "vendors": ["opencontainers", "opencontainers$PRODUCT$runc"]}