{"id":"CVE-2022-50630","revision":"0fe6312a1769402181667444c39a3a37","records":[{"revision":"0fe6312a1769402181667444c39a3a37","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-50630","aliases":[],"title":"mm: hugetlb: fix UAF in hugetlb_handle_userfault","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/","state":0,"publishedAt":"2025-12-08T01:16:45.555+00:00","modifiedAt":"2026-10-15T21:41:21.996+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/hugetlb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45\",\n                            \"lessThan\": \"45c33966759ea1b4040c08dacda99ef623c0ca29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45\",\n                            \"lessThan\": \"0db2efb3bff879566f05341d94c3de00ac95c4cc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45\",\n                            \"lessThan\": \"dd691973f67b2800a97db723b1ff6f07fdcf7f5a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45\",\n                            \"lessThan\": \"78504bcedb2f1bbfb353b4d233c24d641c4dda33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45\",\n                            \"lessThan\": \"958f32ce832ba781ac20e11bb2d12a9352ea28fc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/hugetlb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.150\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.75\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.19.17\",\n                            \"lessThanOrEqual\": \"5.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.0.3\",\n                            \"lessThanOrEqual\": \"6.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29","https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc","https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a","https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33","https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50630","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-50630","identifiers":["CVE-2022-50630"]},"retained":false,"historicalAffected":[]}],"coverage":[]}