BlackTreeCVE Intelligence
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Full vulnerability report · 2023
CVE-2023-0210High confidence

A bug affects the Linux kernel’s ksmbd NTLMv2 authentication and is known to crash the OS immediately in Linux-based systems

Unknown · Linux Kernel

7.5HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 19 Feb 2025

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 71.74% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Linux Kernel and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

5 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.1.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.1.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.1.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.1.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-12299

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

A bug affects the Linux kernel’s ksmbd NTLMv2 authentication and is known to crash the OS immediately in Linux-based systems.

What

A bug affects the Linux kernel’s ksmbd NTLMv2 authentication and is known to crash the OS immediately in Linux-based systems.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

A bug affects the Linux kernel’s ksmbd NTLMv2 authentication and is known to crash the OS immediately in Linux-based systems.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Heap-based Buffer Overflow → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-122 ↗

CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-122Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2023-0080Linux Kernel: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20230329Security Bulletin 29 Mar 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 29 Mar 2023, published on 29 March 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0411Multiples vulnérabilités dans le noyau Linux d'Ubuntu

g/CVERecord?id=CVE-2022-27672 Référence CVE CVE-2022-3108 https://www.cve.org/CVERecord?id=CVE-2022-3108 Référence CVE CVE-2022-36280 https://www.cve.org/CVERecord?id=CVE-2022-36280 Référence CVE CVE-2022-3707 https://www.cve.org/CVERecord?id=CVE-2022-3707 Référence CVE CVE-2022-3903 https://www.cve.org/CVERecord?id=CVE-2022-3903 Référence CVE CVE-2022-4129 https://www.cve.org/CVERecord?id=CVE-2022-4129 Référence CVE CVE-2022-4842 https://www.cve.org/CVERecord?id=CVE-2022-4842 Référence CVE CVE-2022-48423 https://www.cve.org/CVERecord?id=CVE-2022-48423 Référence CVE CVE-2022-48424 https://www.cve.org/CVERecord?id=CVE-2022-48424 Référence CVE CVE-2023-0210 https://www.cve.org/CVERecord?id=CVE-2023-0210 Référence CVE CVE-2023-0394 https://www.cve.org/CVERecord?id=CVE-2023-0394 Référence CVE CVE-2023-0458 https://www.cve.org/CVERecord?id=CVE-2023-0458 Référence CVE CVE-2023-0459 https://www.cve.org/CVERecord?id=CVE-2023-0459 Référence CVE CVE-2023-1073 https://www.cve.org/CVERecord?id=CVE-2023-1073 Référence CVE CVE-2023-1074 https://www.cve.org/CVERecord?id=CVE-2023-1074 Référence CVE CVE-2023-1075 https://www.cve.org/CVERecord?id=CVE-2023-1075 Référence CVE CVE-2023-1078 https://www.cve.org/CVERecord?id=CVE-2023-1078 Référence CVE CVE-2023-1118 https://www.cve.org/CVERecord?id=CVE-2023-1118 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0394Multiples vulnérabilités dans le noyau Linux d'Ubuntu

security/notices/USN-6092-1 Référence CVE CVE-2022-27672 https://www.cve.org/CVERecord?id=CVE-2022-27672 Référence CVE CVE-2022-36280 https://www.cve.org/CVERecord?id=CVE-2022-36280 Référence CVE CVE-2022-3707 https://www.cve.org/CVERecord?id=CVE-2022-3707 Référence CVE CVE-2022-4129 https://www.cve.org/CVERecord?id=CVE-2022-4129 Référence CVE CVE-2022-4139 https://www.cve.org/CVERecord?id=CVE-2022-4139 Référence CVE CVE-2022-4842 https://www.cve.org/CVERecord?id=CVE-2022-4842 Référence CVE CVE-2022-48423 https://www.cve.org/CVERecord?id=CVE-2022-48423 Référence CVE CVE-2022-48424 https://www.cve.org/CVERecord?id=CVE-2022-48424 Référence CVE CVE-2023-0210 https://www.cve.org/CVERecord?id=CVE-2023-0210 Référence CVE CVE-2023-0394 https://www.cve.org/CVERecord?id=CVE-2023-0394 Référence CVE CVE-2023-0458 https://www.cve.org/CVERecord?id=CVE-2023-0458 Référence CVE CVE-2023-0459 https://www.cve.org/CVERecord?id=CVE-2023-0459 Référence CVE CVE-2023-1073 https://www.cve.org/CVERecord?id=CVE-2023-1073 Référence CVE CVE-2023-1074 https://www.cve.org/CVERecord?id=CVE-2023-1074 Référence CVE CVE-2023-1075 https://www.cve.org/CVERecord?id=CVE-2023-1075 Référence CVE CVE-2023-1078 https://www.cve.org/CVERecord?id=CVE-2023-1078 Référence CVE CVE-2023-1118 https://www.cve.org/CVERecord?id=CVE-2023-1118 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0315Multiples vulnérabilités dans le noyau Linux d'Ubuntu

ERecord?id=CVE-2022-42329 Référence CVE CVE-2022-42895 https://www.cve.org/CVERecord?id=CVE-2022-42895 Référence CVE CVE-2022-43750 https://www.cve.org/CVERecord?id=CVE-2022-43750 Référence CVE CVE-2022-4382 https://www.cve.org/CVERecord?id=CVE-2022-4382 Référence CVE CVE-2022-4662 https://www.cve.org/CVERecord?id=CVE-2022-4662 Référence CVE CVE-2022-47929 https://www.cve.org/CVERecord?id=CVE-2022-47929 Référence CVE CVE-2022-48423 https://www.cve.org/CVERecord?id=CVE-2022-48423 Référence CVE CVE-2022-48424 https://www.cve.org/CVERecord?id=CVE-2022-48424 Référence CVE CVE-2023-0045 https://www.cve.org/CVERecord?id=CVE-2023-0045 Référence CVE CVE-2023-0210 https://www.cve.org/CVERecord?id=CVE-2023-0210 Référence CVE CVE-2023-0266 https://www.cve.org/CVERecord?id=CVE-2023-0266 Référence CVE CVE-2023-0394 https://www.cve.org/CVERecord?id=CVE-2023-0394 Référence CVE CVE-2023-0461 https://www.cve.org/CVERecord?id=CVE-2023-0461 Référence CVE CVE-2023-1074 https://www.cve.org/CVERecord?id=CVE-2023-1074 Référence CVE CVE-2023-1095 https://www.cve.org/CVERecord?id=CVE-2023-1095 Référence CVE CVE-2023-1118 https://www.cve.org/CVERecord?id=CVE-2023-1118 Référence CVE CVE-2023-23454 https://www.cve.org/CVERecord?id=CVE-2023-23454 Référence CVE CVE-2023-23455 https://www.cve.org/CVERecord?id=CVE-2023-2345

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0278Multiples vulnérabilités dans le noyau Linux d'Ubuntu

CVERecord?id=CVE-2022-42895 Référence CVE CVE-2022-43750 https://www.cve.org/CVERecord?id=CVE-2022-43750 Référence CVE CVE-2022-4382 https://www.cve.org/CVERecord?id=CVE-2022-4382 Référence CVE CVE-2022-47929 https://www.cve.org/CVERecord?id=CVE-2022-47929 Référence CVE CVE-2022-4842 https://www.cve.org/CVERecord?id=CVE-2022-4842 Référence CVE CVE-2022-48423 https://www.cve.org/CVERecord?id=CVE-2022-48423 Référence CVE CVE-2022-48424 https://www.cve.org/CVERecord?id=CVE-2022-48424 Référence CVE CVE-2023-0045 https://www.cve.org/CVERecord?id=CVE-2023-0045 Référence CVE CVE-2023-0179 https://www.cve.org/CVERecord?id=CVE-2023-0179 Référence CVE CVE-2023-0210 https://www.cve.org/CVERecord?id=CVE-2023-0210 Référence CVE CVE-2023-0266 https://www.cve.org/CVERecord?id=CVE-2023-0266 Référence CVE CVE-2023-0394 https://www.cve.org/CVERecord?id=CVE-2023-0394 Référence CVE CVE-2023-0461 https://www.cve.org/CVERecord?id=CVE-2023-0461 Référence CVE CVE-2023-0469 https://www.cve.org/CVERecord?id=CVE-2023-0469 Référence CVE CVE-2023-1032 https://www.cve.org/CVERecord?id=CVE-2023-1032 Référence CVE CVE-2023-1073 https://www.cve.org/CVERecord?id=CVE-2023-1073 Référence CVE CVE-2023-1074 https://www.cve.org/CVERecord?id=CVE-2023-1074 Référence CVE CVE-2023-1075 https://www.cve.org/CVERecord?id=CVE-2023-1075 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0192Multiples vulnérabilités dans le noyau Linux d'Ubuntu

ecord?id=CVE-2022-45869 Référence CVE CVE-2022-45934 https://www.cve.org/CVERecord?id=CVE-2022-45934 Référence CVE CVE-2022-47518 https://www.cve.org/CVERecord?id=CVE-2022-47518 Référence CVE CVE-2022-47519 https://www.cve.org/CVERecord?id=CVE-2022-47519 Référence CVE CVE-2022-47520 https://www.cve.org/CVERecord?id=CVE-2022-47520 Référence CVE CVE-2022-47521 https://www.cve.org/CVERecord?id=CVE-2022-47521 Référence CVE CVE-2022-47929 https://www.cve.org/CVERecord?id=CVE-2022-47929 Référence CVE CVE-2023-0045 https://www.cve.org/CVERecord?id=CVE-2023-0045 Référence CVE CVE-2023-0179 https://www.cve.org/CVERecord?id=CVE-2023-0179 Référence CVE CVE-2023-0210 https://www.cve.org/CVERecord?id=CVE-2023-0210 Référence CVE CVE-2023-0266 https://www.cve.org/CVERecord?id=CVE-2023-0266 Référence CVE CVE-2023-0461 https://www.cve.org/CVERecord?id=CVE-2023-0461 Référence CVE CVE-2023-0468 https://www.cve.org/CVERecord?id=CVE-2023-0468 Référence CVE CVE-2023-0469 https://www.cve.org/CVERecord?id=CVE-2023-0469 Référence CVE CVE-2023-20928 https://www.cve.org/CVERecord?id=CVE-2023-20928 Référence CVE CVE-2023-23454 https://www.cve.org/CVERecord?id=CVE-2023-23454 Référence CVE CVE-2023-23455 https://www.cve.org/CVERecord?id=CVE-2023-23455 Gestion détaillée du document le 03 mars 2023 Version initiale Alertes

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-006343Linux の Linux Kernel における境界外書き込みに関する脆弱性

Linux の Linux Kernel には、境界外書き込みに関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Linux Kernel: Kernel 6.2 RC4
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 27 Mar 2023 · Last source change 19 Feb 2025, 16:10 UTC · CWE-122 · Heap-based Buffer Overflow

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-12299
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-0210 · cve.blacktree.nl