CVE-2022-47940

HIGHNVD 8.18.1—

8.1

An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.18 before 5.18.18. fs/ksmbd/smb2pdu.c lacks length validation in the non-padding case in smb2_write.

CVSS v3: 8.1
EG Score: 8.1(medium)
EPSS: 78.6%
KEV: Not listed

Published

December 23, 2022

Last Modified

April 14, 2025

References (8)

cve@mitrehttp://www.openwall.com/lists/oss-security/2022/12/23/10
cve@mitrehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
cve@mitrehttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
cve@mitrehttps://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/12/23/10
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
af854a3a-2127-422b-91ae-364da2661108https://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-lowlatency (5.15.0.60.53) @ jammy	2026-05-25	ubuntu
ubuntu	linux-modules-extra-5.15.0-1027-gke (5.15.0-1027.32) @ jammy	2026-05-25	ubuntu
ubuntu	linux-modules-extra-5.15.0-1027-gke (5.15.0-1027.32~20.04.1) @ focal	2026-05-25	ubuntu
ubuntu	linux-headers-azure-fde (5.15.0.1033.40.10) @ jammy	2026-05-25	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2022-47940?

CVE-2022-47940 is a high vulnerability published on December 23, 2022. An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.18 before 5.18.18. fs/ksmbd/smb2pdu.c lacks length validation in the non-padding case in smb2_write.

When was CVE-2022-47940 disclosed?

CVE-2022-47940 was first published in the National Vulnerability Database on December 23, 2022, with the most recent update on April 14, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2022-47940 actively exploited?

CVE-2022-47940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2022-47940?

CVE-2022-47940 has a CVSS v3 base score of 8.1 (NVD).

How do I remediate CVE-2022-47940?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-47940, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2022-47940

Published

Last Modified

References (8)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-47940?

Same vendor

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CVE-2022-47940

📅 Published

🔄 Last Modified

🔗 References (8)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-47940?

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