{"id":"CVE-2023-53171","summary":"vfio/type1: prevent underflow of locked_vm via exec()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: prevent underflow of locked_vm via exec()\n\nWhen a vfio container is preserved across exec, the task does not change,\nbut it gets a new mm with locked_vm=0, and loses the count from existing\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\nto a large unsigned value, and a subsequent dma map request fails with\nENOMEM in __account_locked_vm.\n\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\ntask's mm, which may have changed.  If the saved mm is dead, do nothing.\n\nlocked_vm is incremented for existing mappings in a subsequent patch.","modified":"2026-04-02T09:43:44.310188Z","published":"2025-09-15T14:04:04.544Z","related":["SUSE-SU-2025:03615-1","SUSE-SU-2025:03628-1","SUSE-SU-2025:3716-1","SUSE-SU-2025:3761-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53171.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53171.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53171"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"73fa0d10d077d9521ee2dace2307ae2c9a965336"},{"fixed":"5a271242716846cc016736fb76be2b40ee49b0c3"},{"fixed":"eafb81c50da899dd80b340c841277acc4a1945b7"},{"fixed":"a6b2aabe664098d5cf877ae0fd96459464a30e17"},{"fixed":"b0790dff0760b7734cf0961f497ad64628ca550b"},{"fixed":"046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53171.json"}}],"schema_version":"1.7.5"}