BlackTreeCVE Intelligence
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Full vulnerability report · 2020
CVE-2020-12659High confidence

An issue was discovered in the Linux kernel before 5.6.7

Unknown · Unknown

6.7MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.71% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Unknown 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: As exposure requiresRemediation target: Within 365 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.

Distribution package intelligence

Release-specific package status

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

4 package states
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.5.6.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.6.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.6.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.6.7-1Debian Security Tracker ↗Source updated 6 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2020-12659 · CSAF 2.0 · revision 39 · interimSUSE Product Security TeamCVE-2020-12659
74 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • kernel-default as component of SUSE CaaS Platform 4.0
  • kernel-default-base as component of SUSE CaaS Platform 4.0
  • kernel-default-devel as component of SUSE CaaS Platform 4.0
  • kernel-devel as component of SUSE CaaS Platform 4.0
  • kernel-macros as component of SUSE CaaS Platform 4.0
  • kernel-source as component of SUSE CaaS Platform 4.0
  • reiserfs-kmp-default as component of SUSE CaaS Platform 4.0
  • kernel-default as component of SUSE Enterprise Storage 6
  • kernel-source as component of SUSE Enterprise Storage 6
  • kernel-source-azure as component of SUSE Enterprise Storage 6
  • kernel-devel-azure as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • kernel-source-azure as component of SUSE Linux Enterprise High Performance Computing 12 SP5
Summary
An issue was discovered in the Linux kernel before 5.6.7. xdp_umem_reg in net/xdp/xdp_umem.c has an out-of-bounds write (by a user with the CAP_NET_ADMIN capability) because of a lack of headroom validation.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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-2020-4958

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 actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

An issue was discovered in the Linux kernel before 5.6.7. xdp_umem_reg in net/xdp/xdp_umem.c has an out-of-bounds write (by a user with the CAP_NET_ADMIN capability) because of a lack of headroom validation.

What

An issue was discovered in the Linux kernel before 5.6.7. xdp_umem_reg in net/xdp/xdp_umem.c has an out-of-bounds write (by a user with the CAP_NET_ADMIN capability) because of a lack of headroom validation.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through local access may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

An issue was discovered in the Linux kernel before 5.6.7. xdp_umem_reg in net/xdp/xdp_umem.c has an out-of-bounds write (by a user with the CAP_NET_ADMIN capability) because of a lack of headroom validation.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through local access may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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
local access → Out-of-bounds Write → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
High: elevated access is required
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-787 ↗

CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.

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

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

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-787Public 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-2022-1923Linux Kernel: Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen, Informationen offenzulegen oder nicht spezifizierte Auswirkungen zu verursachen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20200506Security Bulletin 06 May 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 06 May 2020, published on 6 May 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-710Multiples vulnérabilités dans le noyau Linux de Red Hat

cord?id=CVE-2019-9458 Référence CVE CVE-2020-0305 https://www.cve.org/CVERecord?id=CVE-2020-0305 Référence CVE CVE-2020-10732 https://www.cve.org/CVERecord?id=CVE-2020-10732 Référence CVE CVE-2020-10751 https://www.cve.org/CVERecord?id=CVE-2020-10751 Référence CVE CVE-2020-10774 https://www.cve.org/CVERecord?id=CVE-2020-10774 Référence CVE CVE-2020-10942 https://www.cve.org/CVERecord?id=CVE-2020-10942 Référence CVE CVE-2020-11565 https://www.cve.org/CVERecord?id=CVE-2020-11565 Référence CVE CVE-2020-11668 https://www.cve.org/CVERecord?id=CVE-2020-11668 Référence CVE CVE-2020-12655 https://www.cve.org/CVERecord?id=CVE-2020-12655 Référence CVE CVE-2020-12659 https://www.cve.org/CVERecord?id=CVE-2020-12659 Référence CVE CVE-2020-12770 https://www.cve.org/CVERecord?id=CVE-2020-12770 Référence CVE CVE-2020-12826 https://www.cve.org/CVERecord?id=CVE-2020-12826 Référence CVE CVE-2020-14381 https://www.cve.org/CVERecord?id=CVE-2020-14381 Référence CVE CVE-2020-24490 https://www.cve.org/CVERecord?id=CVE-2020-24490 Référence CVE CVE-2020-25641 https://www.cve.org/CVERecord?id=CVE-2020-25641 Référence CVE CVE-2020-25661 https://www.cve.org/CVERecord?id=CVE-2020-25661 Référence CVE CVE-2020-25662 https://www.cve.org/CVERecord?id=CVE-2020-25662 Référence CVE CVE-2020-8647 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-547Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2020-11669 Référence CVE CVE-2020-12114 https://www.cve.org/CVERecord?id=CVE-2020-12114 Référence CVE CVE-2020-12464 https://www.cve.org/CVERecord?id=CVE-2020-12464 Référence CVE CVE-2020-12652 https://www.cve.org/CVERecord?id=CVE-2020-12652 Référence CVE CVE-2020-12653 https://www.cve.org/CVERecord?id=CVE-2020-12653 Référence CVE CVE-2020-12654 https://www.cve.org/CVERecord?id=CVE-2020-12654 Référence CVE CVE-2020-12655 https://www.cve.org/CVERecord?id=CVE-2020-12655 Référence CVE CVE-2020-12656 https://www.cve.org/CVERecord?id=CVE-2020-12656 Référence CVE CVE-2020-12657 https://www.cve.org/CVERecord?id=CVE-2020-12657 Référence CVE CVE-2020-12659 https://www.cve.org/CVERecord?id=CVE-2020-12659 Référence CVE CVE-2020-12769 https://www.cve.org/CVERecord?id=CVE-2020-12769 Référence CVE CVE-2020-12771 https://www.cve.org/CVERecord?id=CVE-2020-12771 Référence CVE CVE-2020-12888 https://www.cve.org/CVERecord?id=CVE-2020-12888 Référence CVE CVE-2020-13143 https://www.cve.org/CVERecord?id=CVE-2020-13143 Référence CVE CVE-2020-13974 https://www.cve.org/CVERecord?id=CVE-2020-13974 Référence CVE CVE-2020-14314 https://www.cve.org/CVERecord?id=CVE-2020-14314 Référence CVE CVE-2020-14331 https://www.cve.org/CVERecord?id=CVE-2020-14331 Référence CVE CVE-2020-14356 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-376Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2020-10757 Référence CVE CVE-2020-12114 https://www.cve.org/CVERecord?id=CVE-2020-12114 Référence CVE CVE-2020-12464 https://www.cve.org/CVERecord?id=CVE-2020-12464 Référence CVE CVE-2020-12652 https://www.cve.org/CVERecord?id=CVE-2020-12652 Référence CVE CVE-2020-12653 https://www.cve.org/CVERecord?id=CVE-2020-12653 Référence CVE CVE-2020-12654 https://www.cve.org/CVERecord?id=CVE-2020-12654 Référence CVE CVE-2020-12655 https://www.cve.org/CVERecord?id=CVE-2020-12655 Référence CVE CVE-2020-12656 https://www.cve.org/CVERecord?id=CVE-2020-12656 Référence CVE CVE-2020-12657 https://www.cve.org/CVERecord?id=CVE-2020-12657 Référence CVE CVE-2020-12659 https://www.cve.org/CVERecord?id=CVE-2020-12659 Référence CVE CVE-2020-12768 https://www.cve.org/CVERecord?id=CVE-2020-12768 Référence CVE CVE-2020-12769 https://www.cve.org/CVERecord?id=CVE-2020-12769 Référence CVE CVE-2020-13143 https://www.cve.org/CVERecord?id=CVE-2020-13143 Gestion détaillée du document le 18 juin 2020 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la sécurité des sy

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-356Multiples vulnérabilités dans le noyau Linux d'Ubuntu

De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un contournement de la politique de sécurité et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-004990Linux Kernel における境界外書き込みに関する脆弱性

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.
Patch available
Affected
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
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 5 May 2020 · Last source change 4 Aug 2024, 12:04 UTC · CWE-787 · Out-of-bounds Write

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-2020-4958
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceNIST NVD
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
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2020-4958↗Vendor CSAF · SUSE Product Security Team↗Public exploit reference↗Patch or update reference↗Patch or update reference↗Vendor advisory↗Official CVE record (CNA and ADP data)↗NVD record↗
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-2020-12659 · cve.blacktree.nl