{"id":"CVE-2025-52881","sourceIdentifier":"security-advisories@github.com","published":"2025-11-06T21:15:42.817","lastModified":"2026-10-07T21:10:00.200","vulnStatus":"Analyzed","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, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. 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 según la especificación OCI. En las versiones 1.2.7, 1.3.2 y 1.4.0-rc.2, un atacante puede engañar a runc para que redirija incorrectamente las escrituras a /proc a otros archivos procfs mediante el uso de un contenedor en carrera con montajes compartidos (también hemos verificado que este ataque es posible de explotar utilizando un Dockerfile estándar con docker buildx build, ya que eso también permite activar la ejecución paralela de contenedores con montajes compartidos personalizados configurados). Esta redirección podría ser a través de enlaces simbólicos en un tmpfs o teóricamente otros métodos como montajes de enlace (bind-mounts) regulares. Aunque similar, la mitigación aplicada para el CVE relacionado, CVE-2019-19921, fue bastante limitada y efectivamente solo hizo que runc verificara que cuando se escriben etiquetas LSM, estas son realmente archivos procfs. Este problema está solucionado en las versiones 1.2.8, 1.3.3 y 1.4.0-rc.3."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"opencontainers","product":"runc","versions":[{"version":"<= 1.2.7, < 1.2.8","status":"affected"},{"version":"<= 1.3.2, < 1.3.3","status":"affected"},{"version":"<= 1.4.0-rc.2, < 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