{"id":"CVE-2026-41579","sourceIdentifier":"security-advisories@github.com","published":"2026-07-01T02:17:00.193","lastModified":"2026-10-25T17:10:00.197","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0."},{"lang":"es","value":"runc es una herramienta CLI para generar y ejecutar contenedores según la especificación OCI. En versiones anteriores a 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1 y 1.5.0-rc.1, al configurar el rootfs del contenedor, setupPtmx y setupDevSymlinks llaman a os.Remove y os.Symlink con una cadena filepath.Join, lo que permite que una imagen con /dev como un enlace simbólico engañe a runc para que elimine archivos llamados ptmx en el host o cree un conjunto de enlaces simbólicos codificados con nombres y destinos específicos en un directorio de host preexistente arbitrario. Este problema no es explotable bajo Docker, porque Docker crea una capa de solo lectura de nivel superior que enmascara cualquier enlace simbólico /dev malicioso presente en la imagen del contenedor - a diferencia de otras herramientas de contenedores Linux, cuyos tiempos de ejecución de nivel superior construidos sobre runc permanecen expuestos a la explotación a través de una imagen maliciosa. Este problema ha sido solucionado en las versiones 1.3.6, 1.4.3 y 1.5.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"opencontainers","product":"runc","versions":[{"version":"< 1.3.6","status":"affected"},{"version":">= 1.4.0-rc.1, < 1.4.3","status":"affected"},{"version":">= 1.5.0-rc.1, < 1.5.0-rc.3","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","baseScore":3.3,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-01T13:34:05.348945Z","id":"CVE-2026-41579","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-61"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*","versionEndExcluding":"1.3.6","matchCriteriaId":"66E8E6E0-E0A3-4C49-A418-D1CA76D0FAEF"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*","versionStartIncluding":"1.4.0","versionEndExcluding":"1.4.3","matchCriteriaId":"3692DBD2-9876-4C63-8C93-2262F86EF95A"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:runc:1.5.0:rc1:*:*:*:*:*:*","matchCriteriaId":"2FEAC66F-F2B2-4B23-8061-3B8B44EAECD8"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:runc:1.5.0:rc2:*:*:*:*:*:*","matchCriteriaId":"ED7FCB70-52A0-42C3-A10F-247FEF7AEC08"}]}]}],"references":[{"url":"https://github.com/opencontainers/runc/commit/864db8042dbb","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47","source":"security-advisories@github.com","tags":["Mitigation","Patch","Vendor Advisory"]}]}