{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-50630", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-08T01:14:55.192Z", "datePublished": "2025-12-08T01:16:45.555Z", "dateUpdated": "2025-12-08T01:16:45.555Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-08T01:16:45.555Z"}, "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/"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/hugetlb.c"], "versions": [{"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "45c33966759ea1b4040c08dacda99ef623c0ca29", "status": "affected", "versionType": "git"}, {"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "0db2efb3bff879566f05341d94c3de00ac95c4cc", "status": "affected", "versionType": "git"}, {"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "dd691973f67b2800a97db723b1ff6f07fdcf7f5a", "status": "affected", "versionType": "git"}, {"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "78504bcedb2f1bbfb353b4d233c24d641c4dda33", "status": "affected", "versionType": "git"}, {"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "958f32ce832ba781ac20e11bb2d12a9352ea28fc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/hugetlb.c"], "versions": [{"version": "4.11", "status": "affected"}, {"version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.10.150"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.19.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.0.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1"}]}]}], "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"}}}}

{}

{"cveTags": [], "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/"}], "id": "CVE-2022-50630", "lastModified": "2025-12-08T18:26:19.900", "metrics": {}, "published": "2025-12-08T02:15:49.223", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}