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NVD / CVE Program· CNA Linux

CVE-2022-50630: mm: hugetlb: fix UAF in hugetlb_handle_userfault

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0db2efb3bff879566f05341d94c3de00ac95c4cc, 45c33966759ea1b4040c08dacda99ef623c0ca29, 78504bcedb2f1bbfb353b4d233c24d641c4dda33.

Low priority for now. Upgrade to Linux Linux 0db2efb3bff879566f05341d94c3de00ac95c4cc, 45c33966759ea1b4040c08dacda99ef623c0ca29, 78504bcedb2f1bbfb353b4d233c24d641c4dda33 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In 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/000000000000d5e00a05e834962e@google.com/ [2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 8, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.11affected
    • 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 and later · before 45c33966759ea1b4040c08dacda99ef623c0ca29affected · git
    • 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 and later · before 0db2efb3bff879566f05341d94c3de00ac95c4ccaffected · git
    • 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 and later · before dd691973f67b2800a97db723b1ff6f07fdcf7f5aaffected · git
    • 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 and later · before 78504bcedb2f1bbfb353b4d233c24d641c4dda33affected · git
    • 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 and later · before 958f32ce832ba781ac20e11bb2d12a9352ea28fcaffected · git
    • before 4.11not affected · semver
    • 5.10.150 and later · up to and including 5.10.*not affected · semver
    • 5.15.75 and later · up to and including 5.15.*not affected · semver
    • 5.19.17 and later · up to and including 5.19.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.3-16.0.3-1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-sourcebefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.133.15.14.21-150500.55.133.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.133.15.14.21-150500.55.133.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.133.15.14.21-150500.55.133.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.133.15.14.21-150500.55.133.1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.290.14.12.14-122.290.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_76before 1-8.7.11-8.7.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_48before 1-150400.9.7.11-150400.9.7.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_34before 1-150500.11.3.11-150500.11.3.1
SUSE:Linux Enterprise Micro 5.2kernel-defaultbefore 5.3.18-150300.59.232.15.3.18-150300.59.232.1
SUSE:Linux Enterprise Micro 5.2kernel-default-basebefore 5.3.18-150300.59.232.1.150300.18.138.15.3.18-150300.59.232.1.150300.18.138.1
SUSE:Linux Enterprise Micro 5.2kernel-rtbefore 5.3.18-150300.232.15.3.18-150300.232.1
SUSE:Linux Enterprise Micro 5.2kernel-source-rtbefore 5.3.18-150300.232.15.3.18-150300.232.1
SUSE:Linux Enterprise Micro 5.3kernel-defaultbefore 5.14.21-150400.24.194.15.14.21-150400.24.194.1
SUSE:Linux Enterprise Micro 5.3kernel-default-basebefore 5.14.21-150400.24.194.1.150400.24.98.35.14.21-150400.24.194.1.150400.24.98.3
SUSE:Linux Enterprise Micro 5.3kernel-rtbefore 5.14.21-150400.15.142.15.14.21-150400.15.142.1
SUSE:Linux Enterprise Micro 5.3kernel-source-rtbefore 5.14.21-150400.15.142.15.14.21-150400.15.142.1
SUSE:Linux Enterprise Micro 5.5kernel-defaultbefore 5.14.21-150500.55.133.15.14.21-150500.55.133.1
SUSE:Linux Enterprise Micro 5.5kernel-default-basebefore 5.14.21-150500.55.133.1.150500.6.65.15.14.21-150500.55.133.1.150500.6.65.1

+7

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40324Dec 8, 2025 · NFSD: Fix crash in nfsd4_read_release()
    30Monitor
  • ← EarlierCVE-2025-40326Dec 8, 2025 · NFSD: Define actions for the new time_deleg FATTR4 attributes
    30Monitor
  • Later →CVE-2023-53747Dec 8, 2025 · vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0db2efb3bff879566f05341d94c3de00ac95c4ccVendor (CNA)
Linux Linux45c33966759ea1b4040c08dacda99ef623c0ca29Vendor (CNA)
Linux Linux78504bcedb2f1bbfb353b4d233c24d641c4dda33Vendor (CNA)
Linux Linux958f32ce832ba781ac20e11bb2d12a9352ea28fcVendor (CNA)
Linux Linuxdd691973f67b2800a97db723b1ff6f07fdcf7f5aVendor (CNA)
debian:linux6.0.3-1 · Debian:12Package registry (OSV)
suse:kernel-64kb5.14.21-150500.55.133.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-default4.12.14-122.290.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-default-base5.14.21-150500.55.133.1.150500.6.65.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-docs5.14.21-150500.55.133.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_341-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build5.14.21-150500.55.133.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-rt5.14.21-150500.13.118.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-source4.12.14-122.290.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-source-rt5.14.21-150500.13.118.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-syms4.12.14-122.290.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-zfcpdump5.14.21-150500.55.133.1 · SUSE:Linux Enterprise Server 15 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_761-8.7.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records