{"api_version":"1","generated_at":"2026-08-05T02:32:39+00:00","cve":"CVE-2022-50630","urls":{"html":"https://cve.report/CVE-2022-50630","api":"https://cve.report/api/cve/CVE-2022-50630.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-50630","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-50630"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2025-12-08 02:15:49","updated_at":"2026-08-04 10:18:20"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc","name":"https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc","name":"https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a","name":"https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33","name":"https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29","name":"https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-50630","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50630","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 45c33966759ea1b4040c08dacda99ef623c0ca29 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 0db2efb3bff879566f05341d94c3de00ac95c4cc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 dd691973f67b2800a97db723b1ff6f07fdcf7f5a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 78504bcedb2f1bbfb353b4d233c24d641c4dda33 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2022","cve_id":"50630","cve":"CVE-2022-50630","epss":"0.001370000","percentile":"0.035240000","score_date":"2026-08-04","updated_at":"2026-08-05 00:03:12"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/hugetlb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"45c33966759ea1b4040c08dacda99ef623c0ca29","status":"affected","version":"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45","versionType":"git"},{"lessThan":"0db2efb3bff879566f05341d94c3de00ac95c4cc","status":"affected","version":"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45","versionType":"git"},{"lessThan":"dd691973f67b2800a97db723b1ff6f07fdcf7f5a","status":"affected","version":"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45","versionType":"git"},{"lessThan":"78504bcedb2f1bbfb353b4d233c24d641c4dda33","status":"affected","version":"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45","versionType":"git"},{"lessThan":"958f32ce832ba781ac20e11bb2d12a9352ea28fc","status":"affected","version":"1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["mm/hugetlb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.11"},{"lessThan":"4.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.150","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.75","versionType":"semver"},{"lessThanOrEqual":"5.19.*","status":"unaffected","version":"5.19.17","versionType":"semver"},{"lessThanOrEqual":"6.0.*","status":"unaffected","version":"6.0.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.150","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.75","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.19.17","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.0.3","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1","versionStartIncluding":"4.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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/"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:09:31.459Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29"},{"url":"https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc"},{"url":"https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a"},{"url":"https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33"},{"url":"https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc"}],"title":"mm: hugetlb: fix UAF in hugetlb_handle_userfault","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-50630","datePublished":"2025-12-08T01:16:45.555Z","dateReserved":"2025-12-08T01:14:55.192Z","dateUpdated":"2026-08-04T09:09:31.459Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-08 02:15:49","lastModifiedDate":"2026-08-04 10:18:20","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"50630","Ordinal":"1","Title":"mm: hugetlb: fix UAF in hugetlb_handle_userfault","CVE":"CVE-2022-50630","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"50630","Ordinal":"1","NoteData":"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/","Type":"Description","Title":"mm: hugetlb: fix UAF in hugetlb_handle_userfault"}]}}}