Today’s Android Security Bulletin included a patch for the Dirty Cow vulnerability, a seven-year-old Linux bug that had yet to be patched by Google.

Google’s November Android Security Bulletin patched 15 critical vulnerabilities, but only a supplemental patch for the Dirty Cow Linux vulnerability.

A privilege escalation vulnerability, nicknamed Dirty Cow and present in Linux since 2007, has been used in public attacks against web-facing Linux servers.