Windows Common Log File System Driver
CVE-2022-24521 — Windows Common Log File System Driver Elevation of Privilege Vulnerability
Executive Summary
None
Overview
7.8
CVSS HIGH
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Functional
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.2
EPSS Score
0.07304
probability of exploitation in the next 30 days
0.93716 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
28 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5012653 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 5012653 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5012596 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5012596 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5012647 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 5012647 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5012647 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 5012591 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 5012591 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for x64-based Systems | 5012591 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for 32-bit Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for ARM64-based Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for x64-based Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for ARM64-based Systems | 5012592 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for x64-based Systems | 5012592 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 5012626 (Monthly Rollup) 5012649 (Security Only) Important Elevation of Privilege 5011552 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.1.7601.25924 Yes 5012626 5012649 Windows 7 for x64-based Systems Service Pack 1 5012626 (Monthly Rollup) 5012649 (Security Only) Important Elevation of Privilege 5011552 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.1.7601.25924 Yes 5012626 5012649 Windows 8.1 for 32-bit systems 5012670 (Monthly Rollup) 5012639 (Security Only) Important Elevation of Privilege 5011564 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows 8.1 for x64-based systems 5012670 (Monthly Rollup) 5012639 (Security Only) Important Elevation of Privilege 5011564 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows RT 8.1 | 5012670 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 5012658 (Monthly Rollup) 5012632 (Security Only) Important Elevation of Privilege 5011534 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.0.6003.21446 Yes 5012658 5012632 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5012658 (Monthly Rollup) 5012632 (Security Only) Important Elevation of Privilege 5011534 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.0.6003.21446 Yes 5012658 5012632 Windows Server 2008 for x64-based Systems Service Pack 2 5012658 (Monthly Rollup) 5012632 (Security Only) Important Elevation of Privilege 5011534 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.0.6003.21446 Yes 5012658 5012632 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5012658 (Monthly Rollup) 5012632 (Security Only) Important Elevation of Privilege 5011534 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.0.6003.21446 Yes 5012658 5012632 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5012626 (Monthly Rollup) 5012649 (Security Only) Important Elevation of Privilege 5011552 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.1.7601.25924 Yes 5012626 5012649 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5012626 (Monthly Rollup) 5012649 (Security Only) Important Elevation of Privilege 5011552 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.1.7601.25924 Yes 5012626 5012649 Windows Server 2012 5012650 (Monthly Rollup) 5012666 (Security Only) Important Elevation of Privilege 5011535 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.2.9200.23679 Yes 5012650 5012666 Windows Server 2012 (Server Core installation) 5012650 (Monthly Rollup) 5012666 (Security Only) Important Elevation of Privilege 5011535 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.2.9200.23679 Yes 5012650 5012666 Windows Server 2012 R2 5012670 (Monthly Rollup) 5012639 (Security Only) Important Elevation of Privilege 5011564 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows Server 2012 R2 (Server Core installation) 5012670 (Monthly Rollup) 5012639 (Security Only) Important Elevation of Privilege 5011564 Base: 7.8 Temporal: 7.2 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows Server 2016 | 5012596 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5012596 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5012647 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5012647 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 | 5012604 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 (Server Core installation) | 5012604 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 5012599 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
5012653 |
Security Update | Yes |
5012596 |
Security Update | Yes |
5012647 |
Security Update | Yes |
5012591 |
Security Update | Yes |
5012599 |
Security Update | Yes |
5012592 |
Security Update | Yes |
5012670 |
Monthly Rollup | Yes |
5012604 |
Security Update | Yes |
Patch Diff
ghidriff · clfs.sys (KB5012592)
Logical-error EoP (ITW 0-day): _CLFS_CONTAINER_CONTEXT->pContainer lives in the base log record and is round-tripped through ClfsEncodeBlock/ClfsDecodeBlock. A crafted .blf overlapping the signatures array (SignaturesOffset) with a container context lets encode/decode resurrect attacker bytes over the kernel-zeroed pContainer; RemoveContainer then performs two indirect calls through it -> kernel RIP control. Patch adds CClfsBaseFile::ValidateRgOffsets (new) called from LoadContainerQ behind Feature_Servicing_38197809: sorts record object offsets (qsort/CompareOffsets), validates CLFS_NODE_IDs, and rejects any record whose context objects cross SignaturesOffset (STATUS_LOG_METADATA_INVALID 0xC01A000D). Secondary hardening: CClfsLogFcbVirtual::Open now KeBugCheckEx-es on internal inconsistency. 2,836/2,838 functions matched; 2 added, 8 code-changed.
| Function | Address | Change | Note |
|---|---|---|---|
CClfsBaseFile::ValidateRgOffsets |
1c00274bc |
added (new function) | 267 bytes; calls OffsetToAddr + qsort; called only from LoadContainerQ; the CVE-2022-24521 fix |
Feature_Servicing_38197809__private_IsEnabled |
1c000c8d4 |
added (new function) | 94 bytes; WIL CFR flag gating the new validation block |
CClfsBaseFilePersisted::LoadContainerQ |
1c0036a90 -> 1c0036ba0 |
code, length, address, calling, called | 2927 -> 3160 bytes, b_ratio 0.85; new flag-gated ValidateRgOffsets call; now calls ValidateRgOffsets + Feature_Servicing_38197809__private_IsEnabled |
CClfsLogFcbVirtual::Open |
1c0042b40 -> 1c0042d40 |
code, length, address, called | 974 -> 1046 bytes, ratio 0.99; new KeBugCheckEx call (secondary hardening) |
`CClfsBaseFilePersisted::LoadContainerQ'::__l1::fin$0 |
|
code, length, address, called | ratio 0.98; SEH funclet updated to clean up new 0x11f0 scratch buffer |
Feature_Servicing_37529451__private_IsEnabled |
|
code | ratio 0.91; pre-existing WIL flag accessor, recompiled (state-cache layout shift) |
wil_details_FeatureReporting_RecordUsageInCache |
|
code | ratio 0.97; WIL telemetry plumbing for new flag |
wil_details_FeatureReporting_ReportUsageToServiceDirect |
|
code | ratio 0.90; WIL telemetry plumbing |
wil_details_FeatureReporting_IncrementUsageInCache |
|
code | ratio 0.98; WIL telemetry plumbing |
wil_details_FeatureReporting_ReportUsageToService |
|
code | ratio 0.87; WIL telemetry plumbing |
OffsetToAddr |
|
calling (no code changes) | referenced by new ValidateRgOffsets |
CompareOffsets |
|
no code changes | qsort comparator used by new ValidateRgOffsets |
NTOSKRNL.EXE::qsort |
|
calling (no code changes) | referenced by new ValidateRgOffsets |
operator_new / operator_delete |
|
no code changes | scratch-buffer alloc/free in patched LoadContainerQ |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Adam Podlosky and Amir Bazine of Crowdstrike
National Security Agency
References
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