{"uuid": "536fa7a2-925b-4186-adc3-40580bda5542", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-3493", "type": "seen", "source": "https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/cve_2021_3493_overlayfs.rb", "content": "{\"actions\": [], \"aliases\": [], \"arch\": \"x64, aarch64\", \"author\": [\"ssd-disclosure\", \"bwatters-r7\"], \"autofilter_ports\": [], \"autofilter_services\": [], \"check\": true, \"default_credential\": false, \"description\": \"This module exploits a vulnerability in Ubuntu's implementation of overlayfs. The\\n          vulnerability is the result of failing to verify the ability of a user to set the\\n          attributes in a running executable. Specifically, when Overlayfs sends the set attributes\\n          data to the underlying file system via `vfs_setxattr`, it fails to first verify the data\\n          by calling `cap_convert_nscap`.\\n          This vulnerability was patched by moving the call to `cap_convert_nscap`\\n          into the `vfs_setxattr` function that sets the attribute, forcing verification every time the\\n          `vfs_setxattr` is called rather than trusting the data was already verified.\", \"disclosure_date\": \"2021-04-12\", \"fullname\": \"exploit/linux/local/cve_2021_3493_overlayfs\", \"is_install_path\": true, \"mod_time\": \"2026-04-22 11:57:34 +0000\", \"name\": \"2021 Ubuntu Overlayfs LPE\", \"needs_cleanup\": true, \"notes\": {\"Reliability\": [\"repeatable-session\"], \"SideEffects\": [\"artifacts-on-disk\"], \"Stability\": []}, \"path\": \"/modules/exploits/linux/local/cve_2021_3493_overlayfs.rb\", \"platform\": \"Linux\", \"post_auth\": false, \"rank\": 500, \"ref_name\": \"linux/local/cve_2021_3493_overlayfs\", \"references\": [\"CVE-2021-3493\", \"URL-https://ssd-disclosure.com/ssd-advisory-overlayfs-pe/\", \"URL-https://github.com/briskets/CVE-2021-3493\"], \"rport\": null, \"session_types\": [\"shell\", \"meterpreter\"], \"targets\": [\"x86_64\", \"aarch64\"], \"type\": \"exploit\"}", "creation_timestamp": "2026-09-08T06:49:06.726797Z"}