BlackTreeCVE Intelligence
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Full vulnerability report · 2020
CVE-2019-20934High confidence

An issue was discovered in the Linux kernel before 5.2.6

Unknown · Unknown

5.3MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. 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 severityMediumOperational priority:Low, lowered one band.downgradedsince 5 Aug 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.32% 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.
  • Monitor vendor guidance and exploitation sources for a material change.

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: No default targetRemediation target: Normal maintenance

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.5.2.6-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian bookwormbookworm · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.2.6-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian forkyforky · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.2.6-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian sidsid · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.2.6-1Debian Security Tracker ↗Source updated 23 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 23 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-2019-20934 · CSAF 2.0 · revision 33 · interimSUSE Product Security TeamCVE-2019-20934
17 known affected

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

  • kernel-source-azure as component of SUSE Linux Enterprise High Performance Computing 15
  • kernel-source-azure as component of SUSE Linux Enterprise Module for Public Cloud 15
  • kernel-source-azure as component of SUSE Linux Enterprise Server 15
  • kernel-source-azure as component of SUSE Linux Enterprise Server for SAP Applications 15
  • SLES 15 SP1 CHOST Images for Amazon EC2
  • SLES 15 SP2 CHOST Images for Amazon EC2
  • SLES 15 SP3 CHOST Images for Amazon EC2
  • SLES 15 SP4 CHOST Images for Amazon EC2
  • SLES 15 SP5 CHOST Images for Amazon EC2
  • SLES 15 SP2 CHOST Images for Google
  • SLES 15 SP3 CHOST Images for Google
  • SLES 15 SP4 CHOST Images for Google
Summary
An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.
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-2019-11463

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

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. 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

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

What

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low 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 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low 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.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Use After Free → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
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-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

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:H/PR:L/UI:N/S:U/C:L/I:N/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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-416
A

Official authority intelligence

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

BSI · German · WID-SEC-2023-0063Juniper Junos Space: Mehrere Schwachstellen

Ein Angreifer aus dem angrenzenden Netzwerk oder ein entfernter anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Juniper Junos Space ausnutzen, um Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand auszulösen, beliebigen Code auszuführen und seine Privilegien zu erweitern.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20201202Security Bulletin 02 Dec 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 02 Dec 2020, published on 2 December 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0051Multiples vulnérabilités dans les produits Juniper

rg/CVERecord?id=CVE-2016-4658 Référence CVE CVE-2016-8625 https://www.cve.org/CVERecord?id=CVE-2016-8625 Référence CVE CVE-2016-8743 https://www.cve.org/CVERecord?id=CVE-2016-8743 Référence CVE CVE-2017-12613 https://www.cve.org/CVERecord?id=CVE-2017-12613 Référence CVE CVE-2018-25032 https://www.cve.org/CVERecord?id=CVE-2018-25032 Référence CVE CVE-2018-8046 https://www.cve.org/CVERecord?id=CVE-2018-8046 Référence CVE CVE-2019-11287 https://www.cve.org/CVERecord?id=CVE-2019-11287 Référence CVE CVE-2019-1543 https://www.cve.org/CVERecord?id=CVE-2019-1543 Référence CVE CVE-2019-1551 https://www.cve.org/CVERecord?id=CVE-2019-1551 Référence CVE CVE-2019-20934 https://www.cve.org/CVERecord?id=CVE-2019-20934 Référence CVE CVE-2020-0465 https://www.cve.org/CVERecord?id=CVE-2020-0465 Référence CVE CVE-2020-0466 https://www.cve.org/CVERecord?id=CVE-2020-0466 Référence CVE CVE-2020-0543 https://www.cve.org/CVERecord?id=CVE-2020-0543 Référence CVE CVE-2020-0548 https://www.cve.org/CVERecord?id=CVE-2020-0548 Référence CVE CVE-2020-0549 https://www.cve.org/CVERecord?id=CVE-2020-0549 Référence CVE CVE-2020-11668 https://www.cve.org/CVERecord?id=CVE-2020-11668 Référence CVE CVE-2020-12362 https://www.cve.org/CVERecord?id=CVE-2020-12362 Référence CVE CVE-2020-12363 https://www.cve.org/CVERecord?id=CVE-2020-1

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-916Multiples vulnérabilités dans les produits Juniper

ERecord?id=CVE-2018-20534 Référence CVE CVE-2018-25032 https://www.cve.org/CVERecord?id=CVE-2018-25032 Référence CVE CVE-2019-0205 https://www.cve.org/CVERecord?id=CVE-2019-0205 Référence CVE CVE-2019-12735 https://www.cve.org/CVERecord?id=CVE-2019-12735 Référence CVE CVE-2019-1543 https://www.cve.org/CVERecord?id=CVE-2019-1543 Référence CVE CVE-2019-1551 https://www.cve.org/CVERecord?id=CVE-2019-1551 Référence CVE CVE-2019-18282 https://www.cve.org/CVERecord?id=CVE-2019-18282 Référence CVE CVE-2019-19532 https://www.cve.org/CVERecord?id=CVE-2019-19532 Référence CVE CVE-2019-20811 https://www.cve.org/CVERecord?id=CVE-2019-20811 Référence CVE CVE-2019-20934 https://www.cve.org/CVERecord?id=CVE-2019-20934 Référence CVE CVE-2019-2435 https://www.cve.org/CVERecord?id=CVE-2019-2435 Référence CVE CVE-2019-2684 https://www.cve.org/CVERecord?id=CVE-2019-2684 Référence CVE CVE-2019-9518 https://www.cve.org/CVERecord?id=CVE-2019-9518 Référence CVE CVE-2020-0427 https://www.cve.org/CVERecord?id=CVE-2020-0427 Référence CVE CVE-2020-0465 https://www.cve.org/CVERecord?id=CVE-2020-0465 Référence CVE CVE-2020-0466 https://www.cve.org/CVERecord?id=CVE-2020-0466 Référence CVE CVE-2020-10769 https://www.cve.org/CVERecord?id=CVE-2020-10769 Référence CVE CVE-2020-12321 https://www.cve.org/CVERecord?id=CVE-2020-123

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-833Multiples vulnérabilités dans le noyau Linux de Red Hat

De multiples vulnérabilités ont été découvertes dans le noyau Linux de Red Hat. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service, une atteinte à l'intégrité des données et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-573Multiples vulnérabilités dans le noyau Linux de Red Hat

De multiples vulnérabilités ont été découvertes dans le noyau Linux de Red Hat. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service, un contournement de la politique de sécurité et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-120Multiples vulnérabilités dans le noyau Linux de SUSE

du 11 février 2021 https://www.suse.com/support/update/announcement/2021/suse-su-20210437-1/ Bulletin de sécurité le noyau Linux de SUSE suse-su-20210438-1 du 11 février 2021 https://www.suse.com/support/update/announcement/2021/suse-su-20210438-1/ Bulletin de sécurité le noyau Linux de SUSE suse-su-20210452-1 du 11 février 2021 https://www.suse.com/support/update/announcement/2021/suse-su-20210452-1/ Référence CVE CVE-2018-10902 https://www.cve.org/CVERecord?id=CVE-2018-10902 Référence CVE CVE-2019-19063 https://www.cve.org/CVERecord?id=CVE-2019-19063 Référence CVE CVE-2019-20806 https://www.cve.org/CVERecord?id=CVE-2019-20806 Référence CVE CVE-2019-20934 https://www.cve.org/CVERecord?id=CVE-2019-20934 Référence CVE CVE-2019-6133 https://www.cve.org/CVERecord?id=CVE-2019-6133 Référence CVE CVE-2020-0444 https://www.cve.org/CVERecord?id=CVE-2020-0444 Référence CVE CVE-2020-0465 https://www.cve.org/CVERecord?id=CVE-2020-0465 Référence CVE CVE-2020-0466 https://www.cve.org/CVERecord?id=CVE-2020-0466 Référence CVE CVE-2020-10781 https://www.cve.org/CVERecord?id=CVE-2020-10781 Référence CVE CVE-2020-11668 https://www.cve.org/CVERecord?id=CVE-2020-11668 Référence CVE CVE-2020-15436 https://www.cve.org/CVERecord?id=CVE-2020-15436 Référence CVE CVE-2020-15437 https://www.cve.org/CVERecord?id=CVE-2020

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-035Multiples vulnérabilités dans le noyau Linux de SUSE

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, une exécution de code arbitraire à distance et un contournement de la politique de sécurité.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-021Multiples vulnérabilités dans le noyau Linux de SUSE

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, une exécution de code arbitraire à distance et un déni de service.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-837Multiples vulnérabilités dans le noyau Linux de SUSE

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, un déni de service et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-820Multiples vulnérabilités dans le noyau Linux de SUSE

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, un déni de service et une atteinte à l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-016117Linux Kernel における解放済みメモリの使用に関する脆弱性

Linux Kernel には、解放済みメモリの使用に関する脆弱性が存在します。 ベンダは、本脆弱性を CID-16d51a590a8c として公開しています。

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
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. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 28 Nov 2020 · Last source change 5 Aug 2024, 03:00 UTC · CWE-416 · Use After Free

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-2019-11463
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-2019-11463↗Vendor CSAF · SUSE Product Security Team↗CVE authority or vendor 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-2019-20934 · cve.blacktree.nl