{ "containers": { "cna": { "affected": [ { "product": "Linux kernel", "vendor": "Ubuntu", "versions": [ { "lessThan": "5.3.0-24.26", "status": "affected", "version": "5.3 kernel", "versionType": "custom" }, { "lessThan": "5.0.0-37.40", "status": "affected", "version": "5.0 kernel", "versionType": "custom" } ] } ], "credits": [ { "lang": "en", "value": "Jann Horn of Google Project Zero" } ], "datePublic": "2019-11-08T00:00:00", "descriptions": [ { "lang": "en", "value": "Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. 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