{"cve":"CVE-2022-50630","nvd":{"published":"2025-12-08T02:15:49.223","modified":"2026-10-15T22:17:31.680","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: hugetlb: fix UAF in hugetlb_handle_userfault\n\nThe vma_lock and hugetlb_fault_mutex are dropped before handling userfault\nand reacquire them again after handle_userfault(), but reacquire the\nvma_lock could lead to UAF[1,2] due to the following race,\n\nhugetlb_fault\n  hugetlb_no_page\n    /*unlock vma_lock */\n    hugetlb_handle_userfault\n      handle_userfault\n        /* unlock mm->mmap_lock*/\n                                           vm_mmap_pgoff\n                                             do_mmap\n                                               mmap_region\n                                                 munmap_vma_range\n                                                   /* clean old vma */\n        /* lock vma_lock again  <--- UAF */\n    /* unlock vma_lock */\n\nSince the vma_lock will unlock immediately after\nhugetlb_handle_userfault(), let's drop the unneeded lock and unlock in\nhugetlb_handle_userfault() to fix the issue.\n\n[1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/\n[2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc","https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29","https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33","https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc","https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2022-50630","score":0.00153,"percentile":0.04372,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}