CVE-2022-50630

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it is not reachable via network packet processing.\nAC:L - The attacker controls both sides of the race\u2014one thread sleeps in handle_userfault after mmap_lock is dropped while another thread munmaps/remaps the same range\u2014creating a large, attacker-driven window to free the VMA/inode before the pointless re-lock.\nPR:L - An unprivileged user can open userfaultfd with UFFD_USER_MODE_ONLY (always allowed) and create hugetlb mappings via MAP_HUGETLB (HUGETLB_ANONHUGE_INODE bypasses the CAP_IPC_LOCK/shm_group check used only for SHM_HUGETLB).\nUI:N - The attacker triggers the fault and concurrent munmap/remap entirely within their own process; no victim action is required.\nS:U - This is a standard in-kernel memory-management UAF that affects the same host kernel privilege boundary, not a VM escape or cross-authority boundary crossing.\nC:H - The UAF is on a freed hugetlbfs_inode slab object (RCU-delayed free), which can be reclaimed and controlled to obtain an arbitrary kernel read primitive.\nI:H - A controllable slab UAF on the hugetlbfs inode enables heap spraying and an arbitrary write / control-flow hijack primitive for privilege escalation.\nA:H - The demonstrated KASAN use-after-free read causes a kernel oops/crash, and any failed exploit attempt can panic or hang the system."}]}], "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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-50630", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:31:42.914433Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:21.996Z"}}]}}

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controls both sides of the race\u2014one thread sleeps in handle_userfault after mmap_lock is dropped while another thread munmaps/remaps the same range\u2014creating a large, attacker-driven window to free the VMA/inode before the pointless re-lock.\nPR:L - An unprivileged user can open userfaultfd with UFFD_USER_MODE_ONLY (always allowed) and create hugetlb mappings via MAP_HUGETLB (HUGETLB_ANONHUGE_INODE bypasses the CAP_IPC_LOCK/shm_group check used only for SHM_HUGETLB).\nUI:N - The attacker triggers the fault and concurrent munmap/remap entirely within their own process; no victim action is required.\nS:U - This is a standard in-kernel memory-management UAF that affects the same host kernel privilege boundary, not a VM escape or cross-authority boundary crossing.\nC:H - The UAF is on a freed hugetlbfs_inode slab object (RCU-delayed free), which can be reclaimed and controlled to obtain an arbitrary kernel read primitive.\nI:H - A controllable slab UAF on the hugetlbfs inode enables heap spraying and an arbitrary write / control-flow hijack primitive for privilege escalation.\nA:H - The demonstrated KASAN use-after-free read causes a kernel oops/crash, and any failed exploit attempt can panic or hang the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "45c33966759ea1b4040c08dacda99ef623c0ca29", "versionType": "git"}, {"status": "affected", "version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "0db2efb3bff879566f05341d94c3de00ac95c4cc", "versionType": "git"}, {"status": "affected", "version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "dd691973f67b2800a97db723b1ff6f07fdcf7f5a", "versionType": "git"}, {"status": "affected", "version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "78504bcedb2f1bbfb353b4d233c24d641c4dda33", "versionType": "git"}, {"status": "affected", "version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45", "lessThan": "958f32ce832ba781ac20e11bb2d12a9352ea28fc", "versionType": "git"}], "programFiles": ["mm/hugetlb.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.11"}, {"status": "unaffected", "version": "0", "lessThan": "4.11", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.150", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.75", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.19.17", "versionType": "semver", "lessThanOrEqual": "5.19.*"}, {"status": "unaffected", "version": "6.0.3", "versionType": "semver", "lessThanOrEqual": "6.0.*"}, {"status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/hugetlb.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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/"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.150", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.75", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, 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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "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": "2026-10-15T22:17:31.680", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-50630", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:31:42.914433Z", "version": "2.0.3"}}]}, "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": "Deferred"}

{"bugzilla": {"description": "kernel: mm: hugetlb: fix UAF in hugetlb_handle_userfault", "id": "2419847", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419847"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: hugetlb: fix UAF in hugetlb_handle_userfault\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,\nhugetlb_fault\nhugetlb_no_page\n/*unlock vma_lock */\nhugetlb_handle_userfault\nhandle_userfault\n/* unlock mm->mmap_lock*/\nvm_mmap_pgoff\ndo_mmap\nmmap_region\nmunmap_vma_range\n/* clean old vma */\n/* lock vma_lock again <--- UAF */\n/* unlock vma_lock */\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[1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/\n[2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/"], "name": "CVE-2022-50630", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50630\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50630\nhttps://lore.kernel.org/linux-cve-announce/2025120854-CVE-2022-50630-3891@gregkh/T"], "threat_severity": "Important"}

{}