mm: hugetlb: fix UAF in hugetlb_handle_userfault

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50630
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-08 02:15:49 UTC
Updated2026-08-04 10:18:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: fix UAF in hugetlb_handle_userfault The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race, hugetlb_fault hugetlb_no_page /*unlock vma_lock */ hugetlb_handle_userfault handle_userfault /* unlock mm->mmap_lock*/ vm_mmap_pgoff do_mmap mmap_region munmap_vma_range /* clean old vma */ /* lock vma_lock again <--- UAF */ /* unlock vma_lock */ Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue. [1] https://lore.kernel.org/linux-mm/[email protected]/ [2] https://lore.kernel.org/linux-mm/[email protected]/

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001370000 probability, percentile 0.035240000 (date 2026-08-04)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 45c33966759ea1b4040c08dacda99ef623c0ca29 git Not specified
CNA Linux Linux affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 0db2efb3bff879566f05341d94c3de00ac95c4cc git Not specified
CNA Linux Linux affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 dd691973f67b2800a97db723b1ff6f07fdcf7f5a git Not specified
CNA Linux Linux affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 78504bcedb2f1bbfb353b4d233c24d641c4dda33 git Not specified
CNA Linux Linux affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 958f32ce832ba781ac20e11bb2d12a9352ea28fc git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 5.10.150 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.75 5.15.* semver Not specified
CNA Linux Linux unaffected 5.19.17 5.19.* semver Not specified
CNA Linux Linux unaffected 6.0.3 6.0.* semver Not specified
CNA Linux Linux unaffected 6.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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